Question

GridView HiddenField

Asked by: RecipeDan

Hello:

A have a drop down box in a gridview that populates based on the hideen value in the gridview. When I run the script there is no error but the dropdown box does not populate.

<asp:GridView ID="GridView1" DataKeyNames="Value_Number_Scale" runat="server" AutoGenerateColumns="False" DataSourceID="GridViewSource" Width="584px">
        <Columns>
        <asp:TemplateField>
        <ItemTemplate>
        <asp:HiddenField Value="<%#Eval("Value_Number_Scale")%>" ID="QuestionValue" runat="server" />
        </ItemTemplate>
        </asp:TemplateField>
            <asp:BoundField DataField="Question_Item" HeaderText="Question_Item" SortExpression="Question_Item" />
            <asp:BoundField DataField="Questions" HeaderText="Questions" SortExpression="Questions" />
            <asp:TemplateField>
            <HeaderTemplate>Response</HeaderTemplate>
            <ItemTemplate>
                <asp:DropDownList ID="QuesValueList" runat="server" />
            </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
Protected Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridView1.RowCommand
        Dim Ques As TextBox = CType(e.CommandSource, TextBox)
        Dim gvRow As GridViewRow = Ques.BindingContainer
        Dim strValue As String = GridView1.DataKeys(gvRow.RowIndex)(0).ToString()
        LoadQuesValueList()
    End Sub
    Private Sub LoadQuesValueList()
        Dim QuesValueList As DropDownList
        Dim conn As SqlConnection
        Dim comm As SqlCommand
        Dim reader As SqlDataReader
        Dim connectionString As String = ConfigurationManager.ConnectionStrings("ValueConn").ConnectionString
        conn = New SqlConnection(connectionString)
        comm = New SqlCommand("SELECT Item_Value, Item_Score FROM ValueID WHERE Value_Number_Scale = @strValue", conn)
        Try
            conn.Open()
            reader = comm.ExecuteReader()
            QuesValueList.DataSource = reader
            QuesValueList.DataValueField = "Item_Score"
            QuesValueList.DataTextField = "Item_Value"
            QuesValueList.DataBind()
            reader.Close()
        Catch ex As Exception
        End Try
    End Sub

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Asked On: 2009-08-29 at 21:31:05ID24692669
Tags: ASP.Net
Topic: Programming for ASP.NET
Participating Experts: 2
Points: 500
Comments: 14

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Answers

by: HainKurtPosted on 2009-08-29 at 21:58:46ID: 25216408

first pass the dropdownlist as parameter to LoadQuesValueList, remove definition on line 25

Private Sub LoadQuesValueList(QuesValueList As DropDownList)

and before calling LoadQuesValueList, find the drop down in the grid and pass it to it...

by: RecipeDanPosted on 2009-08-29 at 23:22:31ID: 25216524

I am still not getting any values:

    Protected Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridView1.RowCommand
        Dim Ques As TextBox = CType(e.CommandSource, TextBox)
        Dim gvRow As GridViewRow = Ques.BindingContainer
        Dim strValue As String = GridView1.DataKeys(gvRow.RowIndex)(0).ToString()
        Dim QuesValueList As DropDownList = DirectCast((gvRow.Cells(3).FindControl("QuesValueList")), DropDownList)
    End Sub
Private Sub LoadQuesValueList(QuesValueList As DropDownList)
        Dim conn As SqlConnection
        Dim comm As SqlCommand
        Dim reader As SqlDataReader
        Dim connectionString As String = ConfigurationManager.ConnectionStrings("ValueConn").ConnectionString
        conn = New SqlConnection(connectionString)
        comm = New SqlCommand("SELECT Item_Value, Item_Score FROM ValueID WHERE Value_Number_Scale = @strValue", conn)
        Try
            conn.Open()
            reader = comm.ExecuteReader()
            QuesValueList.DataSource = reader
            QuesValueList.DataValueField = "Item_Score"
            QuesValueList.DataTextField = "Item_Value"
            QuesValueList.DataBind()
            reader.Close()
        Catch ex As Exception
 
        End Try
    End Sub

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by: HainKurtPosted on 2009-08-30 at 01:01:44ID: 25216720

you are not calling the function and passing the dropdownlist... try this

    Protected Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridView1.RowCommand
        Dim Ques As TextBox = CType(e.CommandSource, TextBox)
        Dim gvRow As GridViewRow = Ques.BindingContainer
        Dim strValue As String = GridView1.DataKeys(gvRow.RowIndex)(0).ToString()
        Dim QuesValueList As DropDownList = DirectCast((gvRow.Cells(3).FindControl("QuesValueList")), DropDownList)
        LoadQuesValueList(QuesValueList)
    End Sub
 
    Private Sub LoadQuesValueList(QuesValueList As DropDownList)
        Dim conn As SqlConnection
        Dim comm As SqlCommand
        Dim reader As SqlDataReader
        Dim connectionString As String = ConfigurationManager.ConnectionStrings("ValueConn").ConnectionString
        conn = New SqlConnection(connectionString)
        comm = New SqlCommand("SELECT Item_Value, Item_Score FROM ValueID WHERE Value_Number_Scale = @strValue", conn)
 
        Try
            conn.Open()
            reader = comm.ExecuteReader()
            QuesValueList.DataSource = reader
            QuesValueList.DataValueField = "Item_Score"
            QuesValueList.DataTextField = "Item_Value"
            QuesValueList.DataBind()
            reader.Close()
        Catch ex As Exception
 
        End Try
    End Sub

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by: RecipeDanPosted on 2009-08-30 at 02:59:01ID: 25216997

still no values in the drop down list. When I look at the source code, the hidden variable is there

<asp:HiddenField Value="ID2" ID="QuestionValue" runat="server" />

When I run this query asnd hard code the value

SELECT Item_Value, Item_Score FROM ValueID WHERE Value_Number_Scale = ID2

I get values in the drop down list

by: guru_samiPosted on 2009-08-30 at 09:20:11ID: 25218183

i don't see you adding parameters to your cmd... not sure if I am overlooking the code....
add this to your code after to declare your cmd object:

cmd.Parameters.AddWithValue("@strValue", QuestionValue.Value)

OR adjust "QuestionValue.Value" to whatever value you want to pass...from GV row, etc.

by: HainKurtPosted on 2009-08-30 at 11:00:45ID: 25218519

also you need to pass strValue to LoadQuesValueList and add a parameter to comamnd object...
or do this...

Protected Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridView1.RowCommand
        Dim Ques As TextBox = CType(e.CommandSource, TextBox)
        Dim gvRow As GridViewRow = Ques.BindingContainer
        Dim strValue As String = GridView1.DataKeys(gvRow.RowIndex)(0).ToString()
        Dim QuesValueList As DropDownList = DirectCast((gvRow.Cells(3).FindControl("QuesValueList")), DropDownList)
        LoadQuesValueList(QuesValueList, strValue)
    End Sub
 
    Private Sub LoadQuesValueList(QuesValueList As DropDownList, strValue as String)
        Dim conn As SqlConnection
        Dim comm As SqlCommand
        Dim reader As SqlDataReader
        Dim connectionString As String = ConfigurationManager.ConnectionStrings("ValueConn").ConnectionString
        conn = New SqlConnection(connectionString)
        comm = New SqlCommand("SELECT Item_Value, Item_Score FROM ValueID WHERE Value_Number_Scale = " & strValue, conn)
 
        Try
            conn.Open()
            reader = comm.ExecuteReader()
            QuesValueList.DataSource = reader
            QuesValueList.DataValueField = "Item_Score"
            QuesValueList.DataTextField = "Item_Value"
            QuesValueList.DataBind()
            reader.Close()
        Catch ex As Exception
 
        End Try
    End Sub

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by: RecipeDanPosted on 2009-08-30 at 13:13:30ID: 25219099

It still does not show any values. Here is what I have so far..

    <asp:GridView ID="GridView1" DataKeyNames="Value_Number_Scale" runat="server" AutoGenerateColumns="False" DataSourceID="GridViewSource" Width="584px">
        <Columns>
        <asp:TemplateField>
        <ItemTemplate>
        <asp:HiddenField Value="<%#Eval("Value_Number_Scale")%>" ID="QuestionValue" runat="server" />
        </ItemTemplate>
        </asp:TemplateField>
            <asp:BoundField DataField="Question_Item" HeaderText="Question_Item" SortExpression="Question_Item" />
            <asp:BoundField DataField="Questions" HeaderText="Questions" SortExpression="Questions" />
            <asp:TemplateField>
            <HeaderTemplate>Response</HeaderTemplate>
            <ItemTemplate>
                <asp:DropDownList ID="QuesValueList" runat="server" />
            </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
 
Protected Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridView1.RowCommand
        Dim Ques As TextBox = CType(e.CommandSource, TextBox)
        Dim gvRow As GridViewRow = Ques.BindingContainer
        Dim strValue As String = GridView1.DataKeys(gvRow.RowIndex)(0).ToString()
        Dim QuesValueList As DropDownList = DirectCast((gvRow.Cells(3).FindControl("QuesValueList")), DropDownList)
        LoadQuesValueList(QuesValueList, strValue)
    End Sub
 
    Private Sub LoadQuesValueList(ByVal QuesValueList As DropDownList, ByVal strValue As String)
        Dim conn As SqlConnection
        Dim comm As SqlCommand
        Dim reader As SqlDataReader
        Dim connectionString As String = ConfigurationManager.ConnectionStrings("ValueConn").ConnectionString
        conn = New SqlConnection(connectionString)
        comm = New SqlCommand("SELECT Item_Value, Item_Score FROM ValueID WHERE Value_Number_Scale = " & strValue, conn)
        comm.Parameters.AddWithValue("@strValue", QuesValueList.Text)
        Try
            conn.Open()
            reader = comm.ExecuteReader()
            QuesValueList.DataSource = reader
            QuesValueList.DataValueField = "Item_Score"
            QuesValueList.DataTextField = "Item_Value"
            QuesValueList.DataBind()
            reader.Close()
        Catch ex As Exception
 
        End Try
    End Sub

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by: guru_samiPosted on 2009-08-30 at 14:01:31ID: 25219333

1: Since you are having this:
comm = New SqlCommand("SELECT Item_Value, Item_Score FROM ValueID WHERE Value_Number_Scale = " & strValue, conn)

Now you don't need to add parameter because you changed your query so remove this line:
comm.Parameters.AddWithValue("@strValue", QuesValueList.Text)

2:Set breakpoint in the function and see if 'strValue' is getting right value....
3: Why do you have the code in RowCommand...? I believe you should do your work in RowDataBound event
4: Since you have DataKeyNamess Set ..the HiddenField is really not required in code-behind.
5: Are you getting right value for strValue here..set breakpoint:
Dim strValue As String = GridView1.DataKeys(gvRow.RowIndex)(0).ToString()

by: RecipeDanPosted on 2009-08-30 at 18:55:23ID: 25220207

I updated the code with suggestions. It looks like the DataKeyNames (strValue) is null.

strValue Nothing String

I looked in the source code and the hidden value is there.
<tr>
<th scope="col"> </th><th scope="col">Question_Item</th><th scope="col">Questions</th><th scope="col">Response</th>
</tr><tr>
<td>
<asp:HiddenField Value="ID4" ID="QuestionValue" runat="server" />
</td>
<td>Ques04</td><td>How are you today?</td><td>
<select name="ctl00$ContentPlaceHolder1$GridView1$ctl02$QuesValueList" id="ctl00_ContentPlaceHolder1_GridView1_ctl02_QuesValueList">
</select>
</td>
</tr>

    <asp:GridView ID="GridView1" DataKeyNames="Value_Number_Scale" OnRowDataBound="GridView1_RowDataBound" runat="server" AutoGenerateColumns="False" DataSourceID="GridViewSource" Width="584px">
        <Columns>
        <asp:TemplateField>
        <ItemTemplate>
        <asp:HiddenField Value="<%#Eval("Value_Number_Scale")%>" ID="QuestionValue" runat="server" />
        </ItemTemplate>
        </asp:TemplateField>
            <asp:BoundField DataField="Question_Item" HeaderText="Question_Item" SortExpression="Question_Item" />
            <asp:BoundField DataField="Questions" HeaderText="Questions" SortExpression="Questions" />
            <asp:TemplateField>
            <HeaderTemplate>Response</HeaderTemplate>
            <ItemTemplate>
                <asp:DropDownList ID="QuesValueList" runat="server" />
            </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
 
    Protected Sub Gridview1_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
        Dim strValue As String = GridView1.DataKeys(e.Row.RowIndex)(0).ToString
        Dim conn As SqlConnection
        Dim comm As SqlCommand
        Dim reader As SqlDataReader
        Dim connectionString As String = ConfigurationManager.ConnectionStrings("ValueConn").ConnectionString
        conn = New SqlConnection(connectionString)
        comm = New SqlCommand("SELECT Item_Value, Item_Score FROM ValueID WHERE Value_Number_Scale = @strValue", conn)
        Dim QuesValueList As New DropDownList
        Try
            conn.Open()
            reader = comm.ExecuteReader()
            QuesValueList.DataSource = reader
            QuesValueList.DataValueField = "Item_Score"
            QuesValueList.DataTextField = "Item_Value"
            QuesValueList.DataBind()
            reader.Close()
        Catch ex As Exception
        End Try
    End Sub

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by: guru_samiPosted on 2009-08-31 at 08:01:09ID: 25223320

Hmm DataKeys being null is something unusual....

Anyways since you are saying hiddenfield is getting value try this in RowDataBound..

Dim hf As HiddenField = DirectCast(e.Row.FindControl("QuestionValue"), HiddenField)
If hf IsNot Nothing Then
-->BP Dim strValue As String = hf.Value
End If

Set BreakPoint(BP) as shown above and see what value you are getting for hf.Value and strValue..

by: RecipeDanPosted on 2009-08-31 at 23:13:07ID: 25228904

I debugged the first two lines and this is what the output is:

hf Nothing System.Web.UI.WebControls.HiddenField
strValue Nothing String

by: guru_samiPosted on 2009-09-01 at 07:25:43ID: 25231893

so if you hit the line --> Dim strValue As String = hf.Value
and your strValue and hf.Value both are nothing ...your hiddenField is not getting the value...

Also you show your hiddenfield Source code like below in browser...
<td>
<asp:HiddenField Value="ID4" ID="QuestionValue" runat="server" />
</td>
It should show something complex like:
<select name="ctl00$ContentPlaceHolder1$GridView1$ctl02$QuesValueList" id="ctl00_ContentPlaceHolder1_GridView1_ctl02_QuesValueList">

and not the asp tag....so not sure how you got that...

Also you have Value="<%#Eval("Value_Number_Scale")%>" and I think that should throw a compile error....
it should be in single quote
Value='<%#Eval("Value_Number_Scale")%>'

Not sure why DataKeys are not working....

by: RecipeDanPosted on 2009-09-04 at 19:09:18ID: 25264686

I still want to come to a resolution on this issue. Maybe i'm looking into it too much. Let me ask this question in a different way.

The code below is how you would do this issue in Classic ASP. So how would you convert it to ASP.Net?

strSQL = "SELECT Questions, Question_Item, Value_Number_Scale FROM ActiveQues"
Set rs = Conn.Execute(strSQL)
 
<table>
<%
Do While Not rs.eof
VNS = rs("Value_Number_Scale")
strSQL1 = "SELECT Item_Value, Item_Score FROM Value_ID WHERE Value_Number_Scale = '"&VNS&"'"
Set rs1 = Conn.Execute(strSQL1)
%>
<tr>
<td>rs("Question_Item")</td><td>rs("Questions")</td><td>select name="WhateverName">
<option></option>
<%
Do While Not rs1.EOF
%>
<option value="<%=rs1("Item_Value")%>"><%=rs1("Item_Score")%></option>
<%
rs1.MoveNext
Loop
%>
 </select>
</td>
</tr>
<%
rs.MoveNext
Loop
%>
</table>

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by: guru_samiPosted on 2009-09-12 at 16:19:15ID: 25318344

check these:
http://www.aspnettutorials.com/tutorials/controls/dropdownlist-gridview-csharp.aspx
http://www.highoncoding.com/Articles/169_DropDownList%20Inside%20GridView%20(Method%201).aspx

20120131-EE-VQP-002

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GridView HiddenField

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