Within my ASP gridview, I have the following (updated to show full gridview):
<asp:GridView ID="TPAnnuity_GridView" AllowSorting="true" AllowPaging="true" Runat="server"
DataSourceID="TPAnnuity_SqlDataSource" DataKeyNames="AnnuityTotalPointsID"
AutoGenerateColumns="False" ShowFooter="true" PageSize="20">
<Columns>
<asp:TemplateField HeaderText="Company" SortExpression="CompanyName" HeaderStyle-VerticalAlign="Bottom">
<ItemTemplate>
<asp:Label ID="Label11" runat="server" Text='<%# Bind("CompanyName") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="EditACompanyID" runat="server" DataSource="<%# ddlCompanyDS %>" DataValueField="CompanyID" DataTextField="CompanyName" selectedValue='<%# Bind("CompanyID") %>'></asp:DropDownList>
</EditItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="NewCompanyID" runat="server" DataSource="<%# ddlCompanyDS %>" DataValueField="CompanyID" DataTextField="CompanyName"></asp:DropDownList>
<asp:RequiredFieldValidator ID="RequiredFieldValidator11" runat="server" ControlToValidate="NewCompanyID" Display="Dynamic" ForeColor="" ErrorMessage="You must enter a value. *" Enabled="false"></asp:RequiredFieldValidator>
</FooterTemplate>
<FooterStyle Wrap="False" />
</asp:TemplateField>
</Columns>
<EmptyDataTemplate>
<br />
<i>No Commission Data to display.</i>
<br />
<br />
</EmptyDataTemplate>
</asp:GridView>
And within my back end, I have the following:
Sub TPAnnuity_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles TPAnnuity_GridView.RowCommand
If e.CommandName = "Cancel" Then
'Reset Footer Row input fields
CType(TPAnnuity_GridView.FooterRow.FindControl("NewCompanyID"), DropDownList).SelectedIndex = 0
ElseIf e.CommandName = "Insert" Then
TPAnnuity_SqlDataSource.InsertParameters.Clear()
Dim test1 As New Parameter("CompanyIDInt", TypeCode.Int32)
test1.DefaultValue = CType(TPAnnuity_GridView.FooterRow.FindControl("NewCompanyID"), DropDownList).SelectedValue
TPAnnuity_SqlDataSource.InsertParameters.Add(test1)
TPAnnuity_SqlDataSource.Insert()
ElseIf e.CommandName = "Update" Then
TPAnnuity_SqlDataSource.UpdateParameters.Clear()
Dim param1 As New Parameter("CompanyIDInt", TypeCode.Int32)
param1.DefaultValue = CType(TPAnnuity_GridView.FooterRow.FindControl("EditACompanyID"), DropDownList).SelectedValue ****THIS IS THE PROBLEM LINE****
TPAnnuity_SqlDataSource.UpdateParameters.Add(param1)
TPAnnuity_SqlDataSource.Update()
End If
End Sub
The Cancel and Insert functions work just fine, operating off of the footer. Every time hit the "Update" button, I get a NullReferenceException on the param1.Default Value = line.
Can anyone help me figure out what's going on here?
Your row should look like this:
param1.DefaultValue = CType(e.CommandSource.FindControl("EditACompanyID"), DropDownList).SelectedValue
Instead of utilizing the FooterRow, you have to use the source row. Since you passed that in with e, you can use this.
Related
As the title states I am having a lot of difficulty populating a drop down list that is within a gridview on my web form. I feel like this process should be relatively straight forward as I have populated many gridviews and drop down lists in the past without a hitch. Below, I have detailed what I have tried and will post any associated code. I am relatively new to software development and any help in solving this problem would be greatly appreciated.
To start I have added a drop down list to the gridview in question. Code below.
<asp:GridView ID="GridView3" runat="server"
EmptyDataText="No Claimed Parts" AutoGenerateColumns="False"
ShowHeaderWhenEmpty="True" DataKeyNames="RecID"
ShowFooter="True" DataSourceID="SqlDataSource5" Width="95%">
<EmptyDataTemplate>
<asp:DropDownList ID="ddlPartEquipmentNew" runat="server" DataSourceID="SqlDataSourcePartEquipment" DataValueField="EquipmentType" DataTextField="EquipmentType"
AppendDataBoundItems="True" Width="270px" Height="20px" Style="margin-left: 70px;">
<asp:ListItem Value="0">---SELECT---</asp:ListItem>
</asp:DropDownList>
<asp:DropDownList ID="ddlPartNew" runat="server" DataSourceID="SqlDataSourcePart" DataValueField="RecID"
DataTextField="description" AppendDataBoundItems="True" Width="270px" Height="20px"
style="margin-left: 70px; margin-right: 110px">
<asp:ListItem Value="0">---SELECT---</asp:ListItem>
</asp:DropDownList>
<asp:textbox ID="txtUnitPriceNew" runat="server" Width="95px"/>
<asp:textbox ID="txtTaxNew" runat="server" Width="95px" text="0"/>
<asp:Button ID="InsertDetail" runat="server" CommandName="InsertDetail" Height="25px" Text="Add Detail" Width="85px" />
</EmptyDataTemplate>
<AlternatingRowStyle BackColor="#CCCCCC" />
<Columns>
<asp:CommandField ShowEditButton="True" footertext="Add -->" ShowDeleteButton="True" HeaderStyle-Width="70px"/>
<asp:BoundField DataField="RecID" HeaderText="RecID" SortExpression="RecID" ReadOnly="True" Visible="False" />
<asp:TemplateField HeaderText="Parts Description" ItemStyle-HorizontalAlign="center">
<ItemTemplate>
<asp:label ID="lblDescriptionAdd" Text='<%# Bind("PartFailed") %>' runat="server"/>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="ddlPartEquipmentEdit" runat="server" DataValueField="Agreement" DataTextField="EquipmentType"
AppendDataBoundItems="True" Width="270px" Height="20px" Style="margin-left: 70px;">
<asp:ListItem Value="0">---SELECT---</asp:ListItem>
</asp:DropDownList>
<asp:DropDownList ID="ddlPartEdit" runat="server" DataSourceID="SqlDataSourcePart" DataValueField="RecID" DataTextField="description" SelectedValue='<%# Eval("RepairID")%>' AppendDataBoundItems="True" Width="270px"/>
</EditItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="ddlPartEquipmentInsert" runat="server" DataValueField="Agreement" DataTextField="EquipmentType"
AppendDataBoundItems="True" Width="270px" Height="20px" Style="margin-left: 70px;">
<asp:ListItem Value="0">---SELECT---</asp:ListItem>
</asp:DropDownList>
<asp:DropDownList ID="ddlPartInsert" runat="server" DataSourceID="SqlDataSourcePart" DataValueField="RecID" DataTextField="description" AppendDataBoundItems="True" Width="270px">
<asp:ListItem Value="0">---SELECT---</asp:ListItem>
</asp:DropDownList>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Part Cost Requested" ItemStyle-HorizontalAlign="center" HeaderStyle-Width="100px">
<ItemTemplate>
<asp:label ID="lblUnitPrice" Text='<%# Bind("PartCost", "{0:C}") %>' runat="server" Enabled="False"/>
</ItemTemplate>
<EditItemTemplate>
<asp:textbox ID="txtUnitPriceEdit" Text='<%# Bind("PartCost") %>' Enabled="true" runat="server"/>
</EditItemTemplate>
<FooterTemplate>
<asp:textbox ID="txtUnitPriceInsert" Text='<%# Bind("PartCost") %>' runat="server" style="width: 100%; box-sizing: border-box;"/>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Tax" ItemStyle-HorizontalAlign="Center" HeaderStyle-Width="100px">
<ItemTemplate>
<asp:LinkButton ID="lbTaxTotal" Text='<%# Bind("Tax", "{0:C}")%>' runat="server" CommandArgument="Part" OnClick="lblTaxTotal_Click"/>
<asp:HiddenField ID="hidPartGST" runat="server" Value='<%# Bind("GST")%>' />
<asp:HiddenField ID="hidPartPST" runat="server" Value='<%# Bind("PST")%>' />
<asp:HiddenField ID="hidPartQST" runat="server" Value='<%# Bind("QST")%>' />
<asp:HiddenField ID="hidPartHST" runat="server" Value='<%# Bind("HST")%>' />
</ItemTemplate>
<EditItemTemplate>
<asp:textbox ID="lblTaxTotalEdit" Text='<%# Bind("Tax")%>' Enabled="true" runat="server"/>
</EditItemTemplate>
<FooterTemplate>
<asp:textbox ID="txtTaxTotalInsert" Text="0" runat="server" Enabled="true" style="width: 100%; box-sizing: border-box;"/>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Insert New" HeaderStyle-Width="85px">
<ItemTemplate>
<asp:Label ID="lblEmpty" Text="" runat="server" Width="75px"/>
</ItemTemplate>
<FooterTemplate>
<asp:Button ID="Insert" runat="server" CommandName="InsertNewDetail" Height="22px" Text="Insert" style="width: 100%; box-sizing: border-box;" />
</FooterTemplate>
</asp:TemplateField>
</Columns>
<HeaderStyle BackColor="#336699" ForeColor="White" />
</asp:GridView>
In the above code, the gridview is declared and there are a series of controls within the gridview. The control in question is "ddlPartEquipmentNew" (technically I am having the same problem with the 2 other drop downs labeled "ddlPartEquipmentEdit" and "ddlPartEquipmentInsert" respectively, however we can ignore those at the moment.)
For whatever reason I cannot seem to figure out how to bind this ddl to the appropriate values I have in my database.
Below I will go into detail on what I have tried and the various outputs I have gotten.
One of the first things I have tried was to create a GetData() Function and then call that function in the gridviews OnDataBound() event, however when doing this, though I don't receive an error, the drop down has no values other than the default "---SELECT---" I setup in the aspx code above.
Below I have attached the code for the GetData() function and code for the OnDataBound() procedure.
GetData()
Private Function GetEquipmentData(query As String) As DataSet
Dim conString As SqlConnection = objCn
Dim cmd As New SqlCommand(query)
Using conString
Using sda As New SqlDataAdapter()
cmd.Connection = conString
sda.SelectCommand = cmd
Using ds As New DataSet()
sda.Fill(ds, txtAgreement.Text)
Return ds
End Using
End Using
End Using
End Function
OnDataBound()
Protected Sub GridView3_DataBound(sender As Object, e As EventArgs) Handles GridView3.DataBound
Dim partRequestedTotal As Decimal = Decimal.Zero
Dim partTotal As Decimal = Decimal.Zero
Dim gv As GridView = sender
If gv.EditIndex = -1 Then
For Each row As GridViewRow In gv.Rows
If row.RowType = DataControlRowType.DataRow Then
Dim lblAmount As Label = row.FindControl("lblUnitPrice")
Dim lblAmountRequested As Label = row.FindControl("lblUnitPrice")
Dim ddlPartEquipmentNew As DropDownList = row.FindControl("ddlPartEquipmentNew")
ddlPartEquipmentNew.DataSource = GetEquipmentData("SELECT EquipmentType FROM Equipment WHERE Agreement = #Agreement")
ddlPartEquipmentNew.DataTextField = "EquipmentType"
ddlPartEquipmentNew.DataValueField = "EquipmentType"
ddlPartEquipmentNew.DataBind()
'Dim lblMarkup As Label = row.FindControl("lblMarkup")
Dim partRequested As Decimal = Decimal.Parse(lblAmountRequested.Text, NumberStyles.Currency)
'Convert.ToDecimal(lblAmountRequested.Text.Replace("$", ""))
Dim partValue As Decimal = Decimal.Parse(lblAmount.Text, NumberStyles.Currency)
'Convert.ToDecimal(lblAmount.Text.Replace("$", ""))
'Dim markupValue As Decimal = Decimal.Parse(lblMarkup.Text, NumberStyles.Currency)
'Convert.ToDecimal(lblMarkup.Text.Replace("$", ""))
'partTotal = partValue + partTotal + markupValue
partRequestedTotal = partRequestedTotal + partRequested
End If
Next
'txtPartsTotal.Text = partTotal.ToString
txtPartsRequested.Text = partRequestedTotal.ToString("N2")
If GridView3.Rows.Count > 0 Or GridView1.Rows.Count > 0 Then
calculateTotalTax()
calculateTotal()
Else
txtTax.Text = "0"
Me.txtGrandTotal.Text = "0"
End If
End If
End Sub
With this attempt at binding the drop down list I receive no errors however the drop down in question remains empty.
I have also tried to create a databind event for the drop down list specifically and in the OnDataBind() event for the control I reference the procedure I created, however when I do this I get an exception error stating that I have a connection to the database that has not been closed, or a timeout exception.
Below is the code for the ddl databind event
Protected Sub DDLPartEquipmentNew_DataBind(sender As Object, e As EventArgs)
Dim ddlPartEquipmentNew As DropDownList = sender
Using con As New SqlConnection(ConfigurationManager.ConnectionStrings("WarrantyConnectionString").ToString)
Using cmd As New SqlCommand("SELECT EquipmentType FROM Equipment WHERE Agreement = #Agreement")
cmd.Parameters.Add("#Agreement", SqlDbType.Int).Value = txtAgreement.Text
cmd.CommandType = CommandType.Text
con.Open()
cmd.Connection = con
ddlPartEquipmentNew.DataSource = cmd.ExecuteReader()
ddlPartEquipmentNew.DataBind()
con.Close()
End Using
End Using
End Sub
As a last note on the situation I am having, the other drop down controls in this gridview are populated using an asp:SqlDataSource control which I have also tried, the issue I run into using a datasource in the aspx page is that my query requires a variable and so far I have not found a way to declare that variable in the code behind to avoid the exception "Must declare Scalar Variable #Agreement". The especially weird part about this exception is that in the stack trace it is popping this exception inside the databind event for a different gridview.
Query in question: SELECT EquipmentType FROM Equipment WHERE Agreement = #Agreement
Relatively simple, or at least I would think so. Any help someone would be able to offer on this problem would be greatly appreciated as I am at a loss as to how to populate this drop down, let alone any other drop down lists I may have to add to the page.
I'm using asp.net web form gridview and I run into a problem when inserting a new record from footer.
my footer has the different input that should be submitted but when I submit the record they change.
for example, I have an input fname if I type the name "Issa" I get it like this ",Issa"
the "," character is being added and I don't know why
this is how I retrieve the record.
Dim fname As String = TryCast(staffs_gridvw.FooterRow.FindControl("footer_sfname_txtbox"), TextBox).Text.Trim
and this is how my templet field looks like.
<asp:TemplateField HeaderText="First Name">
<ItemTemplate>
<asp:Label runat="server" Text='<%#Eval("sfname") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="sfname_txtbox" CssClass="form-control" runat="server" Text='<%#Eval("sfname") %>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="footer_sfname_txtbox" CssClass="form-control" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
any suggestion on how can I fix this issue???
Hum, I am un-able to re-produce this error.
My markup:
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" ShowFooter="true">
<Columns>
<asp:TemplateField HeaderText="First Name">
<ItemTemplate>
<asp:Label runat="server" Text='<%#Eval("FirstName") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="sfname_txtbox" CssClass="form-control" runat="server" Text='<%#Eval("FirstName") %>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="footer_sfname_txtbox" CssClass="form-control" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:Button ID="Button1" runat="server" Text="Button" />
My code to fill:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack Then
LoadGrid
End If
End Sub
Sub LoadGrid()
Dim rstData As DataTable
rstData = MyRst("SELECT * FROM tblHotelsA ORDER BY HotelName")
GridView1.DataSource = rstData
GridView1.DataBind()
End Sub
We now get this:
So I type in hello world into that text box, hit the button, with this code:
Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim fname As String = TryCast(GridView1.FooterRow.FindControl("footer_sfname_txtbox"), TextBox).Text.Trim
Debug.Print(fname)
End Sub
And I see this:
So, I guess the question is what other operations are you doing to that GV?
Edit: Button is also in the the GV footer
Ok, so then we have this:
<div style="padding:25px;width:20%">
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" ShowFooter="true" CssClass="table">
<Columns>
<asp:TemplateField HeaderText="First Name">
<ItemTemplate>
<asp:Label runat="server" Text='<%#Eval("FirstName") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="sfname_txtbox" CssClass="form-control" runat="server" Text='<%#Eval("FirstName") %>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="footer_sfname_txtbox" CssClass="form-control" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Hotel">
<ItemTemplate>
<asp:Label ID="lblHotel" runat="server" Text='<%#Eval("HotelName") %>' ></asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:Button ID="Button2" runat="server" Text="Button" />
</FooterTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</div>
And code to load - same as before.
So, now we see this:
Of course, the button is now in the GV - so I can't double click to wire up a event, but you of course then use markup.
Type in onclick= (hit ctrl-space bar under the quotes) - and then you get this option:
Ok, so now we have our event behind.
This code:
Protected Sub Button2_Click(sender As Object, e As EventArgs)
Dim fname As String = TryCast(GridView1.FooterRow.FindControl("footer_sfname_txtbox"), TextBox).Text.Trim
Debug.Print(fname)
End Sub
And now this:
And click on button, I see/get this:
I have following gridview in aspx page:
<asp:GridView Runat="server" id="gv1" PageSize="20" Visible="False" AllowPaging="True" Width="100%"
CssClass="clsDataGrid" AutoGenerateColumns="false" DataKeyNames="intProofSLNo,txtAdminRemarks" CommandArgument='Eval(intProofSLNo,txtAdminRemarks)'
OnRowCommand="gv1_RowCommand" OnRowDataBound ="gv1_OnRowDataBound" >
<asp:BoundField DataField="intProofSLNo" ReadOnly="True" Visible="false" ItemStyle-Wrap="false" HeaderText="Sl No" ItemStyle-CssClass="clsNormalText"></asp:BoundField>
<asp:TemplateField HeaderText="Action">
<ItemTemplate>
<asp:LinkButton ID="lnkbtnApprove" runat="server" CommandName="Approve" Text= "Approve / " />
<asp:LinkButton ID="lnkbtnReject" runat="server" CommandName="Reject" Text= "Reject" />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Admin Remarks">
<ItemTemplate>
<asp:Label ID="lblAdminRemarks" runat="server" ItemStyle-Wrap="True" Text='<%# Bind("txtAdminRemarks")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtAdminRemarksEdit" runat="server" cssclass=clsCommonInput MaxLength="252" Text='<%# DataBinder.Eval(Container.DataItem, "txtAdminRemarks")%>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Edit">
<ItemTemplate>
<asp:LinkButton ID="lblEdit" runat="server" Text="Edit" ToolTip="Edit" CommandName="Edit" CommandArgument='<%# Container.DataItemIndex %>'>
</asp:LinkButton>
</ItemTemplate>
<EditItemTemplate>
<asp:LinkButton ID="lnkUpdate" Width="38" runat="server" Text="Update|" CommandName="Update"CommandArgument='<%# Container.DataItemIndex %>' CausesValidation="true" ToolTip="Save"> </asp:LinkButton>
<asp:LinkButton ID="lnkCancel" runat="server" Width="40" Text="Cancel" CommandName="Cancel"
CausesValidation="false" ToolTip="Reset"></asp:LinkButton>
</EditItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
The user clicks on the 'Edit' link which makes 'Update' and 'Cancel' links visible.It then enters the remarks in the textbox and clicks 'Update'.A row command event is fired which updates the remarks in DB for the entry in that particular row. The same event calls the bind function:
Protected Sub gv1_RowCommand(sender As Object, e As GridViewCommandEventArgs)
If e.CommandName = "Update" Then
//some code to update remarks//
gv1.EditIndex = -1
subBindDataGrid()
End If
The subBindDataGrid() fires the following rowbound event which hides the buttons depending on admin remarks:
Protected Sub gv1_OnRowDataBound(sender As Object, e As GridViewRowEventArgs)
If e.Row.RowType = DataControlRowType.DataRow Then
Dim lblAdminRemarks As Label = DirectCast(e.Row.FindControl("lblAdminRemarks"), Label)
Dim lnkReject As LinkButton = DirectCast(e.Row.FindControl("lnkbtnReject"), LinkButton)
Dim lnkApprove As LinkButton = DirectCast(e.Row.FindControl("lnkbtnApprove"), LinkButton)
Dim lnkEdit As LinkButton = DirectCast(e.Row.FindControl("lblEdit"), LinkButton)
If DataBinder.Eval(e.Row.DataItem, "txtAdminRemarks").ToString().Trim = "Auto-Approved" Then
lnkApprove.Visible = False
lnkReject.Visible = False
lnkEdit.Visible = False
Else
lnkbtnApprove.Visible = True
lnkbtnReject.Visible = True
End If
End If
The remarks get updated in the DB. However, there is some issue in binding and instead of displaying the grid, the page is redirected to an error page. There is no exception thrown anywhere while debugging. The same events are also called in 'Edit'command. However, the functionality works fine there.Please suggest if there is anything wrong with the syntax.
I see you don't define a DataSourceID on the GridView static definition, please make sure you define a DataSource for the GridView in the subBindDataGrid procedure, otherwise it will have a null datasource in input.
I have a GridView,
without using SelectedIndexChanged, how can I retrieve the value of each row from GridView when click on each button in each row?
this is my aspx code
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="ProductID"
DataSourceID="SqlDataSource1" ShowHeader="False" AllowPaging="True" BorderColor="White"
CellPadding="6" GridLines="None" Height="100px" Width="800px">
<Columns>
<asp:TemplateField>
<ItemTemplate>
Card Name:
<asp:Label ID="Label1" runat="server" Text='<%# Bind("Name") %>'></asp:Label>
<br />
Cost :
<asp:Label ID="Label2" runat="server" Text='<%# Bind("Price") %>'></asp:Label>
<br />
<asp:Label ID="Label3" runat="server" Text='<%# Bind("ProductImgID") %>'></asp:Label>
<asp:Image ID="Image3" runat="server" ImageUrl='<%# Eval("ProductImgUrl", "images/{0}") %>' />
<br />
<asp:Button ID="btnAddProduct" runat="server" Text="Add" />
<br />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
One option can be to Bind the CommandArgument of the button to the ProductID
<asp:Button ID="btnAddProduct" runat="server" Text="Add" CommandArgument='<%#Bind("ProductID")%>' />
and then in the RowCommand event retrieve the ProductID and extract the row from database
string prodID=(string)e.CommandArgument()
then using the ID retrieve the row from database.
To get a row value, you have to get the row Reference, After getting the row you can easily get to the specified column and can get the value
Lets Consider you have a "link button control" in a template field column. For the gridview you have to set Row Command Event, and also in the edit template of the column, set a command name for the link button also say "lnkTest"
In RowCommand Event you have to include the following section of code
if(e.CommandName.Equals("lnkTest")) // Checks that link button was clicked
{
GridViewRow grdRow = (((LinkButton)e.CommandSource).Container)
// This Will give you the reference of the Row in which the link button was clicked
int grdRowIndex = grdRow.RowIndex;
//This will give you the index of the row
var uniqueDataKeyValue = GridView1.DataKeys[grdRowIndex].Value;
//This will give you the DataKey Value for the Row in which the link Control was click
Hope the above code will help
Add CommandArgument='<%# Container.DataItemIndex %>' to your Add button
<asp:Button ID="btnAddProduct" runat="server" Text="Add" CommandArgument='<%# Container.DataItemIndex %>'/>
To retrive Name, in gridview row command use this code
Dim gvr As GridViewRow = grvGRNCONs.Rows(e.CommandArgument)
Dim name As String = DirectCast(gvr.FindControl("Label1"), Label).Text
and so on..
<asp:GridView ID="grdResults" CssClass="CommonTable dataTable" AutoGenerateColumns="false" runat="server">
<Columns>
<asp:TemplateField HeaderText="Sl#">
<ItemTemplate>
<asp:Label ID="lblSlno" Text='<%# Container.DataItemIndex+1 %>' runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="" ControlStyle-Height="15px" ControlStyle-Width="15px">
<HeaderStyle HorizontalAlign="Left" />
<ItemStyle HorizontalAlign="Left" CssClass="PInfoTd" />
<ItemTemplate>
<asp:ImageButton ID="lknassesno" ToolTip="Edit Assessment" Width="50" CssClass="NewButton" ***CommandName="LINK"***
runat="server" ImageUrl="~/img/Edit.png" />
<asp:HiddenField ID="hidassesmentno" Value='<%# EVAL("PAN_CODE")%>' runat="server" />
<asp:HiddenField ID="hidPendStatus" Value='<%# EVAL("Pstatus")%>' runat="server" />
<asp:HiddenField ID="hidIPNO"Value='<%#EVAL("IP_NO")%>' runat="server" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
**code behind**
Protected Sub grdResults_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles grdResults.RowCommand
If **e.CommandName = "LINK"** Then
Dim ctrl As Control = e.CommandSource
Dim grrow As GridViewRow = ctrl.Parent.NamingContainer
'Dim i As Integer = Convert.ToInt16(e.CommandArgument)
'Dim lknassesno As HiddenField = DirectCast(e.CommandSource, ImageButton)
Dim hidAssesmentNo As HiddenField = DirectCast(grdResults.Rows(grrow.RowIndex).FindControl("hidassesmentno"), HiddenField)
Dim lblstatus As HiddenField = DirectCast(grdResults.Rows(grrow.RowIndex).FindControl("hidPendStatus"), HiddenField)
Dim hidIpNo As HiddenField = DirectCast(grdResults.Rows(grrow.RowIndex).FindControl("hidIPNO"), HiddenField)
Dim Assno As String = hidAssesmentNo.Value
Dim Ipno As String = hidIpNo.Value
Dim st As String = ""
If lblstatus.Value = "Pending" Then
st = "E"`enter code here`
ElseIf lblstatus.Value = "Completed" Then
st = "V"
End If
Response.Redirect("Assessment.aspx?PAssNo=" & Assno & "&Mode=" & st & "&IPNO=" & Ipno & "")
End If
End Sub
I am trying to hide/display a linkbutton in my gridview based on wether not the row in the Gridview is part of my shopping cart.
This is the gridview
<asp:GridView ID="productListTable" runat="server" DataSourceID="srcProductListPerCustomer" AutoGenerateColumns="False" AlternatingRowStyle-CssClass="tr_dark" HeaderStyle-CssClass="header_req" BorderWidth="0px" GridLines="None" AllowPaging="true" PageSize="25" EmptyDataText="No records." AllowSorting="false" Width="100%" DataKeyNames="product_ID_key" OnRowDataBound="productListTable_RowDataBound" OnRowCommand="productListTable_RowCommand" >
<Columns>
<asp:TemplateField HeaderText="Product Name" HeaderStyle-Width="250px" SortExpression="productName" ItemStyle-CssClass="product_name" >
<ItemTemplate>
<asp:Label ID="ProductNameField" runat="server" Text='<%# Eval("productName").ToString() %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<Columns>
<asp:TemplateField HeaderText="Quantity">
<ItemTemplate>
<asp:TextBox runat="server" ID="txtQuantity" Columns="5"></asp:TextBox><br />
<asp:LinkButton runat="server" ID="btnRemove" Text="Remove" CommandName="Remove" CommandArgument='<%# Eval("product_ID_key") %>' style="font-size:12px;" Visible="false"></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<HeaderStyle CssClass="header_req" />
<AlternatingRowStyle CssClass="tr_dark" />
<PagerStyle CssClass="pagination" />
<PagerSettings PageButtonCount="3" FirstPageText="First" LastPageText="Last" NextPageText="Next" PreviousPageText="Previous" Mode="NumericFirstLast" />
</asp:GridView>
The way I am trying to do this at the moment is by row data bound
Protected Sub productListTable_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs) Handles productListTable.RowDataBound
' If we are binding the footer row, let's add in our total
If e.Row.RowType = DataControlRowType.DataRow Then
'e.Row.Cells(6).Text = "Total Price: " & ShoppingCart.Instance.GetSubTotal().ToString("C")
Dim productId = Convert.ToInt32(productListTable.DataKeys(e.Row.RowIndex).Value)
Dim txtQuantity As TextBox = CType(e.Row.Cells(1).FindControl("txtQuantity"), TextBox)
Dim removeButton As LinkButton = CType(e.Row.Cells(1).FindControl("btnRemove"), LinkButton)
Dim updatedItem = New CartItem(productId)
For Each item As CartItem In ShoppingCart.Instance.Items
If item.Equals(updatedItem) Then
txtQuantity.Text = item.Quantity
removeButton.Visible = True
End If
Next
End If
End Sub
And it works fine, but not at the initial refresh of the page when adding a new product but only after a hard refresh I see the button appear. Do I need to perform this check in a different lifecycle or gridview event so i can see the update immediately ?