I am trying to pass an Id from aspx to .cs. This is the code i have in the aspx:
<asp:Button ID="btnAddAsFriend" runat="server" Text="Add as Friend" onclick="btnAddAsFriend_Click" CommandName = "Id" CommandArgument='<%# Eval("u.UserID.ToString()") %>'/>
The CommandArgument is being set but when i try to read it from the .cs its getting null. This is the code I have in the .cs
protected void btnAddAsFriend_Click(object sender, EventArgs e)
{
string id = ((Button)sender).CommandArgument;
}
Thanks
Related
How do you achive something like below in asp.net?
<asp:Label runat="server" Text="The '<%# CustomValue %>' you assigned."/>
This usually depends on where your Label resides. If it is a stond alone control, not nested inside a repeater, you just set your code in code behind:
Label1.Text = $"The {CustomValue} you assigned.";
If the label is nested inside an ItemTemplate in some sort of Repeater control, you can strongly type it to an objects property:
<asp:Repeater runat="server" ID="MyRepeater" ItemType="WebFormsSandbox.Person">
<ItemTemplate>
<li>
<%#: Item.FirstName %> <%#: Item.LastName %>
</li>
</ItemTemplate>
</asp:Repeater>
and the corresponding code behind:
protected void Page_Load(object sender, EventArgs e)
{
MyRepeater.DataSource = Persons();
MyRepeater.DataBind();
}
IEnumerable<Person> Persons()
{
for (int i = 0; i < 10; i++)
{
yield return new Person { Id= i, FirstName = $"Foo{i}", LastName = $"Bar{i}" };
}
}
This would create a list of links, where you then could do anything with it. Whether this would pop up a custom window or does a postback .. up to you.
If you really want to do it that way, write the string inside the server tags.
<asp:Label runat="server" Text='<%# "The " + CustomValue + " you assigned." %>'/>
However if the Label is not inside a GridView, Repeater etc you have to call DataBind manually.
protected void Page_Load(object sender, EventArgs e)
{
DataBind();
}
You would typically do this in the code behind on page load, unless you were using a datagrid or repeater control. Assign an ID to your control and reference it like so.
<asp:Label runat="server" ID="Label1" />
protected void Page_Load(object sender,EventArgs e)
{
Label1.Text = "Your Value";
}
HELP! Is it achievable to use LinkButton or Gridview_RowDeleting method to simultaneously delete a file from a DataBase and from a Folder? Below is my code using a LinkButton:
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton ID = "lnkDelete" Text = "Delete" OnClientClick="return confirm('Are you sure you want to delete this record?');" CommandArgument = '<%# DataBinder.Eval(Container.DataItem,"ID") %>' runat = "server" OnClick = "DeleteFile" />
</ItemTemplate>
</asp:TemplateField>
Code Behind:
protected void grdProducts_RowEditing(object sender, GridViewEditEventArgs e)
{
//Get seleted row
GridViewRow row = grdProducts.Rows[e.NewEditIndex];
//Get Id of selected product
int rowId = Convert.ToInt32(row.Cells[1].Text);
//Redirect user to Manage Products along with the selected rowId
Response.Redirect("~/Pages/Management/ManageProducts.aspx?id=" + rowId);
}
protected void DeleteFile(object sender, EventArgs e)
{
string filePath = (sender as LinkButton).CommandArgument;
File.Delete(filePath);
Response.Redirect(Request.Url.AbsoluteUri);
}
PL: I have an existing gridview and a datasource for my table.
Thank you all for your contribution. I later got the answer to this. I will like to share it with all. Just enable OnRowDeleting in your Gridview properties then use the code behind below.
protected void grdProducts_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
Image oImg = grdProducts.Rows[e.RowIndex].FindControl("ImageFile") as Image;
if (oImg != null)
{
string sUrl = oImg.ImageUrl;
File.Delete(Server.MapPath(sUrl));
grdProducts.DataBind();
}
}
}
Finally: put this TemplateField on your aspx page.
<asp:TemplateField>
<ItemTemplate>
<asp:Image ID="ImageFile" runat="server" ImageUrl='<%# Bind("Image", "Images/Products/{0}")%>' AlternateText="Picture unavailable" style="width:50px; height:40px" />
</ItemTemplate>
</asp:TemplateField>
<asp:repeater id="rpt" run="server">
<ItemTemplate>
<asp:LinkButton id="Delete" runat="server" OnCommand="Delete_Command"></asp:linkButton>
<asp:label id="lblMessage" run="server">
</ItemTemplate>
</asp:repeater>
Code Behind:
protected void Delete_Command(object sender, CommandEventArgument e)
{
}
how i get the reference to the "lblMessage" in Delete_Command.
Try this:
protected void Delete_Command(object sender, CommandEventArgs e)
{
LinkButton button = (LinkButton)sender;
Label label = (Label)button.NamingContainer.FindControl("lblMessage");
// do something with the label
}
If you:
Have bound the repeater
Have ViewState enabled
Do not re-bind the repeater earlier in the post back
this should work. If not, please verify that the id of the label is indeed exactly the same as in the ...FindControl("lblMessage");. Also make sure that runat="server" is set on all the controls involved.
Edit: One more thing to check: Search the markup file (the .aspx file) and check if there are any other controls that also use the same event in the code behind. If another control is using the same event handler and that control is not in the repeater, the label will not be found.
means are you want find a lable in Delete_Command event?
in aspx
<asp:Repeater ID="rpt" runat="server">
<ItemTemplate>
<asp:LinkButton ID="Delete" runat="server" OnCommand="Delete_Command"></asp:LinkButton>
<asp:Label ID="lblMessage" run="server">
</ItemTemplate>
</asp:Repeater>
in aspx.cs
protected void Delete_Command(object sender, CommandEventArgs e)
{
foreach (RepeaterItem item in rpt.Items)
{
Label lblMessage = item.FindControl("lblMessage") as Label;
if (lblMessage != null)
{
lblMessage.Text = "";
}
}
}
If You want to make it in your way use following code in
protected void Repeater1_ItemCommand(object source, CommandEventArgs e)
{
(((LinkButton)source).NamingContainer).FindControl("lblName")
}
Another approach.. But something that you can buy
aspx
<asp:Repeater ID="Repeater1" runat="server"
onitemcommand="Repeater1_ItemCommand">
<ItemTemplate>
<asp:Label ID="lblName" runat="server" Text='<%=Eval("Name") %>' ></asp:Label>
<asp:LinkButton runat="server" CommandName="Delete_Command" Text="sd"></asp:LinkButton>
</ItemTemplate>
</asp:Repeater>
.cs
protected void Delete_Command(object sender, CommandEventArgument e)
{
if(e.CommandName != null)// Conditional Check
{
Label label = e.Item.FindControl("lblMessage");
// do something with the label
}
}
I'm having a problem trying to find a label control that is inside a GridView.
Please see my codes below:
<asp:GridView ID="MyGridView" runat="server">
<Columns>
<asp:TemplateField HeaderText="Date">
<ItemTemplate>
<asp:TextBox runat="server" ID="txtDate" MaxLength="10" Width="70" />
<asp:ImageButton ID="imgScoreDate" runat="server" ImageUrl="~/images/calendar.gif" />
<ajaxtoolkit:CalendarExtender ID="txtDate_CalendarExtender" runat="server" Enabled="True" Format="MM/dd/yyyy" TargetControlID="txtDate" PopupButtonID="imgDate" />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Name">
<ItemTemplate>
<asp:Label ID="lblName" runat="server"/>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
And here is my .cs file:
protected void LoadGridView()
{
//Do something else
foreach (GridViewRow row in MyGridView.Rows)
{
//Tried A
System.Web.UI.WebControls.Label lblName = row.FindControl("lblName") as System.Web.UI.WebControls.Label;
lblName.Text = "Name";
//Tried B
((System.Web.UI.WebControls.Label)row.FindControl("lblName")).Text = "Name";
}
}
I debug this code and it seems to work fine because my breakpoint is being hit each time the debugger runs. It even loops through my foreach block the same count as to how many rows my GridView has.
But I don't understand why my lblName control doesn't get the "Name" text as a value? Am I missing anything here? I tried both //Tried A and //Tried B methods but they both doesn't update my label's text.
Any help would be appreciated!
Thanks! Cheers!
You want to call LoadGridView inside PreRender. Basically, you want to call it after GridView is bound with data.
protected void Page_PreRender(object sender, EventArgs e)
{
LoadGridView();
}
Look at PreRender event of ASP.NET Page Life Cycle.
On your gridview add:
<asp:GridView OnRowDataBound="MyGridView_RowDataBound" ... />
Then define MyGridView_RowDataBound:
void CustomersGridView_RowDataBound(Object sender, GridViewRowEventArgs e)
{
Label l = (Label) e.Row.FindControl("lblName");
}
What I think is happening is the control is not recreated server side in its current spot.
try this
on .aspx page
<asp:GridView ID="MyGridView" runat="server"
onrowdatabound="MyGridView_RowDataBound" .../>
code behind ::
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
LoadGridView();
}
}
void LoadGridView()
{
DataTable dt = new DataTable();
// dt= call ur database method to get data
MyGridView.DataSource = dt;
MyGridView.DataBind();
}
protected void MyGridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
Label lbl_Name = (Label)e.Row.FindControl("lblName");
lbl_Name.Text = "Name";
}
}
cheers!
I have such a page
<form runat="server" id="NewForm">
Name: <asp:TextBox ID="Name" runat="server"></asp:TextBox>
<asp:Button ID="AddNewName" runat="server" Text="Add" OnClick="AddNewName_Click" />
<asp:Label ID="NewName" runat="server"></asp:Label>
</form>
In the code behind, I have a Page_Load which assign a value to the TextBox Name.
protected void Page_Load(object sender, EventArgs e)
{
Name.Text = "Enter Your Name Here";
}
Then upon the Click on the button AddNewName, I will write it in the Label NewName
protected void AddNewDivision_Click(object sender, EventArgs e)
{
NewName.Text = Name.Text;
}
But, no matter what I input in the Name TextBox, the Label only displays "Enter Your Name Here". It never updates to the actual content in the Name TextBox. What am I doing wrong with this code?
The problem is that you are always overwriting the changed value in Page_Load. Instead, check the IsPostBack property:
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
Name.Text = "Enter Your Name Here";
}
You are re-assigning the text to Name every time Page_Load that over writes the text you entered in TextBox before reach AddNewDivision_Click event. To assign it once on page load and do not over write the subsequent calls you can use Page.IsPostBack property.
if(!Page.IsPostBack)
Name.Text = "Enter Your Name Here";
Or you can assign the text in design html and remove the statement from page_load
<asp:TextBox ID="Name" runat="server" Text="Enter Your Name Here"></asp:TextBox>
Another immediately obvious issue is:
<form runat="server" id="NewForm">
Name: <asp:TextBox ID="Name" runat="server"></asp:TextBox>
<asp:Button ID="AddNewName" runat="server" Text="Add" **OnClick="AddNewName_Click"** />
<asp:Label ID="NewName" runat="server"></asp:Label>
</form>
Not the asterisks above. Then, you were wondering why this didn't run:
protected void **AddNewDivision_Click**(object sender, EventArgs e)
{
NewName.Text = Name.Text;
}
Again, note the asterisks. You weren't calling the correct void, in fact you were probably calling a void that didn't even exist.