I have a dropdownlist which I constantly use.
I wrote a method to load this dropdown.
Though when I call the method only the Text part of the item is passed.
This is the method
Public Shared Function ddlLoadResumes() As DropDownList
Dim connString As String = ConfigurationManager.ConnectionStrings("LocalSqlServer").ConnectionString
Dim conn As SqlConnection = New SqlConnection(connString)
Dim ddSelectResumeList As New DropDownList
Dim dtResumes As New DataTable()
Dim comm As SqlCommand = New SqlCommand("usr_SelectResumeList", conn)
comm.CommandType = CommandType.StoredProcedure
comm.Parameters.Add("#UserName", SqlDbType.VarChar, 50).Value = Membership.GetUser().UserName
Try
Dim daResumes As New SqlDataAdapter(comm)
conn.Open()
daResumes.Fill(dtResumes)
ddSelectResumeList.DataSource = dtResumes
ddSelectResumeList.DataTextField = "ResumeName"
ddSelectResumeList.DataValueField = "Res_ID"
ddSelectResumeList.DataBind()
' Handle the error
Catch ex As Exception
Finally
conn.Close()
End Try
Return ddSelectResumeList
End Function
and this is how I call it
ddSelectResume.DataSource = MailClass.ddlLoadResumes.Items
ddSelectResume.DataBind()
Dim ltitem As ListItem
For Each ltitem In ddSelectResume.Items
Response.Write(ltitem.Value + "-----" + ltitem.Text)
Next returns only the text part
I need both DataTextField and DataValueField.
Thank you in advance
This seems like kind of an odd approach. One thing to resolve your issue would be to just set the ddSelectResume equal to the DropDownList object your Function is returning:
ddSelectResume = MailClass.ddlLoadResumes
Dim ltitem As ListItem
For Each ltitem In ddSelectResume.Items
Response.Write(ltitem.Value + "-----" + ltitem.Text)
Next
Though I think a better approach would be to just have "ddlLoadResumes return the DataTable (dtResumes), and set that as the datasoure of ddSelectResumes (you'd still have to set the DataTextField and DataValueField properties).
Related
I am working on a website with VB.NET and ASP.NET. I currently have recurring DropDownLists for the user to provide input.
The design is recurring. These DropDownLists get their values from a database table, Everything with the Web interface is working except for writing these recurring values to the database - that is just to give you some background.
I have set the ID's of each DropDownList like so:
FrequencyList.ID = String.Concat("FreqList", DBReader(0))
That is in a loop while reading the DatabaseReader.
This is what I'm having issues with (please note I simplified the code down to make it easier to read:
Dim i As Integer
DBCommand = New SqlCommand()
DBCommand.Connection = DBConnection
DBCommand.CommandType = Data.CommandType.StoredProcedure
DBCommand.CommandText = "StoredProcedureName"
DBConnection.Open()
For i = 1 To AspectTableLength
Dim ParamFrequencyID As SqlParameter = DBCommand.Parameters.Add("#nFrequencyID", SqlDbType.Int)
ParamFrequencyID.Value = FindControl("FreqList" & Convert.ToString(i))
ParamFrequencyID.Direction = ParameterDirection.Input
Next
The FindControl("FreqList" & Convert.ToString(i)) variable is incorrect because it does not access the value - and adding .SelectedItem.Value does not work.
I got help from a developer.
Dim MyControls As ControlCollection = Panel.Controls
Dim Number As Integer 'this is the same as "DBReader(0)"
For Each MyControl As Control In MyControls
If MyControl.ID Is Nothing Then
Else
If MyControl.ID.StartsWith("Span") Then
Number = Replace(MyControl.ID, "Span", "")
Dim Freq As DropDownList = PanelMain.FindControl(“FreqList” & Number)
Dim ParamFrequencyID As SqlParameter = DBCommand.Parameters.Add("#nFrequencyID", SqlDbType.Int)
ParamFrequencyID.Value = Freq.SelectedIndex
ParamFrequencyID.Direction = ParameterDirection.Input
DBCommand.ExecuteNonQuery()
DBCommand.Parameters.Clear()
End If
End If
Next
DBConnection.Close()
I'm having a problem populating a child gridview using a function I define. I keep getting the error "Object reference not set to an instance of an object". What am I doing wrong? Am I using the FindControl function incorrectly? It doesn't seem to find the child gridview.
Sub RecordsByZip()
Dim DBConn As New SqlConnection(Application("DBConn"))
Dim gv1 As GridView
gv1 = grdTotal
Dim gv2 As GridView
gv2 = DirectCast(gv1.FindControl("grdChild"), GridView)
Dim ZipCode = lbZip.SelectedItem
For Each ZipCode In lbZip.Items
If ZipCode.Selected = True Then
Dim cmdZip As SqlCommand = New SqlCommand("spPICAInsertTotals2", DBConn)
cmdZip.CommandType = CommandType.StoredProcedure
strZip = ZipCode.Text
strUser = Session("User")
Dim Zip As New SqlParameter("#Zip", SqlDbType.VarChar)
Zip.Value = strZip
cmdZip.Parameters.Add(Zip)
Dim UserID As New SqlParameter("#UserID", SqlDbType.Int)
UserID.Value = strUser
cmdZip.Parameters.Add(UserID)
DBConn.Open()
gv1.DataSource = cmdZip.ExecuteReader
gv1.DataBind()
gv1.Visible = True
DBConn.Close()
End If
Next
btnExport.Visible = True
lblmsg.Visible = False
' Dim DBConn = New SqlConnection(Application("DBConn"))
Dim cmdCounty As SqlCommand = New SqlCommand("spPICAInsertTotals", DBConn)
cmdCounty.CommandType = CommandType.StoredProcedure
'Dim gv As GridView = TryCast(e.Row.FindControl("grdChild"), GridView)
strUser = Session("User")
Dim UserID2 As New SqlParameter("#UserID", SqlDbType.Int)
UserID2.Value = strUser
cmdCounty.Parameters.Add(UserID2)
DBConn.Open()
gv2.DataSource = cmdCounty.ExecuteReader
gv2.DataBind()
gv2.Visible = True
DBConn.Close()
btnExport.Visible = True
lblmsg.Visible = False
lblInstructions.Visible = False
End Sub
First of all . . .
Just as a disclaimer, I normally use repeater controls instead of gridview controls.
But this may help you . . .
I can tell you that with repeater controls, if you want to find a nested repeater then you must look for them inside the item of the parent repeater to which they belong. Essentially, what you are trying to do with the code above, is find grdChild when there might actually be several grdChild (it is a nested gridview, after all). I'd be willing to bet this is where you're object reference error is occurring.
In other words, if you want to find the nested repeater with the ID nestedRepeater, and you know it is located in the first item of your main repeater (which in this case I've assigned to the myRepeater variable), you can do this:
Dim myItem as RepeaterItem = myRepeater.Items(0)
Dim Rep2 as Repeater = myItem.FindControl("nestedRepeater")
Using SqlDataAdapter and a DataSet (recommended)
Dim sa As New SqlDataAdapter(cmdCounty) 'Initialize the SqlDataAdapter and assign the SqlCommand object to it.
Dim ds As New DataSet() 'Initialize the DataSet (we will bind this to the gridview)
Try 'The Try/Catch statements help you to handle errors.
cmdCounty.Connection.Open() 'Open the connection to the database.
sa.Fill(ds) 'This statement uses the SqlDataAdapter to easily execute the SqlCommand (using the query specified in the SqlCommand object) and . . .
'. . .use that data to fill our dataset.
cmdCounty.Connection.Close() 'These statement close the connection and dispose of the SqlCommand object. Note: You may only need the dispose command.
cmdCounty.Dispose()
Catch ex As Exception
'Catch your error here.
cmdCounty.Connection.Close()
cmdCounty.Dispose()
End Try
gv2.DataSource = ds 'Set the datasource for your GridView control.
gv2.DataBind() 'Bind the data.
Using SqlDataReader and a DataTable
According to your comment, you're code is breaking when you assign the gridview to the cmd.ExecuteReader.
You will need to access your data using a method like this:
Dim rdr as SqlDataReader = cmdCounty.ExecuteReader() 'Declare the SqlDataReader and set it to handle your SqlCommand.
Dim dt as New DataTable 'Initialize a new DataTable. This is where we will place the information we read using the SqlDataReader.
'Make sure you add the columns...
dt.Columns.Add("firstColumnName") 'Create a column for each field you will be retrieving data from.
dt.Columns.Add("secondColumnName")
Dim r as DataRow 'Declare the variable r as a DataRow.
'You may want to insert the line "If rdr.HasRows Then" to check if any data was pulled before attempting to read it.
While rdr.Read() 'Loop through each row in the reader.
r = dt.NewRow() 'Set r to equal a new DataTable in the DataTable we created. Note: This does not actually add the row to the table.
r("firstColumnName") = rdr("firstColumnName") 'Set the values of each column in the current DataRow to equal their corresponding data read from SQL.
r("secondColumnName") = rdr("secondColumnName")
dt.Rows.Add(r) 'Add the DataRow r to the DataTable.
End While 'Loop back until there are no more rows.
gv2.DataSource = dt
gv2.DataBind()
Both of these examples assume you have already created your SqlCommand object and have assigned a working SQL query string and Connection object to it.
I am new to asp.net and here I am trying to populate a single text box with a value from database.
I have created this code but not working:
Try
Dim MyCon As New SqlConnection("server = servername; uid = sa; pwd =abc; database = master")
Dim MyCommand As New SqlCommand("Select empFirstName from Employees where empid=2")
MyCon.Open()
Dim MyReader = MyCommand.ExecuteReader()
While MyReader.Read()
Dim sqlda = New SqlDataAdapter()
Dim dt As New Data.DataTable()
Dim ds As New Data.DataSet
sqlda.Fill(ds)
TextBox1.Text = ds.Tables(0).ToString
MyCon.Close()
End While
Please correct the code and tell me where I am wrong.
Kindly suggest me a link if any to read more on this topic for beginners with example.
Try this sample, it will work for you http://geekswithblogs.net/dotNETvinz/archive/2008/09/12/bind-textbox-and-label-control-with-data-from-database.aspx
ds.Tables(0)
will return a DataTable
If you want to get the tablename, write this instead:
ds.Tables(0).TableName
If you want to get value returned, write this kind of code:
ds.Tables(0).Rows(0).Item("empFirstName")
This will store only the 1st row from the database
TextBox1.Text = ds.Tables(0).Rows(0)(0).ToString();
Row(0)(0) indicates to get the 1st row from the 1st column
If the query is returning more than 1 rows then u need to iterate the data table and store it in a List(Of String) instead of an array as you don't know the number of rows returned from the query
Dim EmpFirstName As New List(Of String)
Dim myRow As DataRow
Dim myColumn As DataColumn
For Each myRow in dt.Rows
EmpFirstName.Add(myRow(dt.Columns(0)))
Next
The data table is returning the correct amount of rows/records.But for some reason I can not get my GridView to Render..nothing displays at all...........
EDIT: The GridView returns "RowErorrs" and "Has Errors" columns. but not my data.
Dim ConnString As String = System.Configuration.ConfigurationManager.ConnectionStrings("oakfratintdbConnectionString").ConnectionString
Dim Conn As New SqlConnection(ConnString)
Dim cmd As New SqlCommand("SELECT * FROM [OFCInterments]", Conn)
Dim DA As New SqlDataAdapter(cmd)
Dim DT As New DataTable
'WHERE ([FirstName] = #FirstName)
cmd.Parameters.AddWithValue("#FirstName", "Mike")
Try
Conn.Open()
DA.SelectCommand = cmd
DA.Fill(DT)
GridView1.DataSource = DT
GridView1.DataBind()
If DT.Rows.Count > 0 Then
Dim NoResultsText As String = DT.Rows.Count.ToString + " records found."
txtStatys.Text = NoResultsText
txtStatys.Visible = True
End If
Catch ex As Exception
Throw ex
Finally
Conn.Close()
DA.Dispose()
Conn.Dispose()
End Try
The GridView returns "RowErorrs" and "Has Errors" columns. but not my data.
That is not a property of the GridView but of the DataTable.
DataTable.HasErrors property
You can use DataTable.GetErrors() to retrieve a DataTable with all row errrors. Inspect the RowError property of each DataRow and you know the reason for the exception. You can do that all in a debugger quick-watch-window.
A few points you should take into account:
GridView is not dispayed, some possible reasons:
Is the GridView visible at all(and all of it's parents because it inherits the property)?
have you registered the RowDataBound event and an uncaught exception there?
general suggestions:
Don't use a Catch block just to rethrow the exception(even Throw alone would be better since it would keep the stacktrace). Instead don't catch it or do something useful with it(f.e. logging).
use the Using-statement to dispose your ADO.NET objects like the connection(closes it implicitely)
i want to search a record from sql database searching by first name so im using a function in the data layer but it is not working please correct me where i went wrong here is my function:
Public Function searchCustomer(ByVal custFname As String) As DataTable
Dim tabletdata As New DataTable
Dim conn As New SqlConnection(con_string)
conn.Open()
Dim dCmd As New SqlCommand("selectCustomerByFname", conn)
dCmd.CommandType = CommandType.StoredProcedure
Try
dCmd.Parameters.AddWithValue("#Cust_Fnam", custFname)
'dCmd.ExecuteNonQuery()
Dim dadaptr As New SqlDataAdapter(dCmd)
dadaptr.SelectCommand = dCmd
dadaptr.SelectCommand.ExecuteNonQuery()
dadaptr.Fill(tabletdata)
Return tabletdata
Catch
Throw
Finally
dCmd.Dispose()
conn.Close()
conn.Dispose()
End Try
End Function
Fill method opens and close connection implicitly. Fill Method
SUMMARY: The Fill method retrieves
rows from the data source using the
SELECT statement specified by an
associated SelectCommand property. The
connection object associated with the
SELECT statement must be valid, but it
does not need to be open. If the
connection is closed before Fill is
called, it is opened to retrieve data,
then closed. If the connection is open
before Fill is called, it remains
open.
Public Function searchCustomer(ByVal custFname As String) As DataTable
Dim tabletdata As New DataTable
Dim conn As New SqlConnection(con_string)
Dim dCmd As New SqlCommand("selectCustomerByFname", conn)
dCmd.CommandType = CommandType.StoredProcedure
dCmd.Parameters.AddWithValue("#Cust_Fnam", custFname)
Dim dadaptr As New SqlDataAdapter(dCmd)
dadaptr.SelectCommand = dCmd
dadaptr.Fill(tabletdata)
Return tabletdata
End Function