Hi, I got information from here quite often.

I just want to share my experience this time and hope it might help someone someday.

I have a DropDownList in my GridView's PagerTemplate.

I used the example code from http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.gridview.pagertemplate(VS.80).aspx

I used it in many of my pages. All works fine except one.

The OnSelectedIndexChanged event just isn't fired in that one page.

Later I set the "EnableViewState" of that GridView to false, it works finally.

 Hi I am newbie in ASP .net. I have a gridview with the first column as a template field of dropdownlist. All the other fields in the Gridview are have a value of  0 or 1.The dropdownlist has three items viz. "Make All 0", "Make All 1" and "Edit". What I would like to do is that when a user selects "Make All 0", all the other fields for that row should change to 0. Similarly for "Make All 1" all the fields in the that row should change to 1. And if the user selects "Edit" from the list the user should be able to edit the row, i.e. set the value of each of the fields one by one. Again, these values can either be 0 or 1.

My problem is I don't know how to trigger an event just by selecting an item from the dropdownlist which is within a gridview.

I would really appreciate it if you could help me out with this.

I am using VB for coding. But even if you have a solution in C# I don't mind taking a look at it.

Thanks

In your .aspx file,  you have something like the following. You define DropDownList1_SelectedIndexChanged() in your .vb file.

<asp:TemplateField>
                                <ItemTemplate>
                                    <asp:DropDownList ID="DropDownList1" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
                                    <asp:ListItem Value="0">0</asp:ListItem>
                                    <asp:ListItem Value="1">1</asp:ListItem>
                                    </asp:DropDownList>

</ItemTemplate>

</asp:TemplateField>

 Thanks for the reply. But, I am still not able to achieve what I intend to. SelectedIndexChanged doesn't trigger an event. Here is what i did

asp code

<asp:TemplateField>
                     <ItemTemplate>
                                    <asp:DropDownList ID="DropDownList1" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
                                            <asp:ListItem Value="0">Make all 0</asp:ListItem>
                                            <asp:ListItem Value="1">Make all 1</asp:ListItem>
                                            <asp:ListItem Value="2">Edit</asp:ListItem>
                                            <asp:ListItem Selected="True" > </asp:ListItem>
                                  </asp:DropDownList>>

                     </ItemTemplate>

</asp:TemplateField>

And the vb code i used is;

Protected Sub DropDownList1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)
  

 If CType(GridView1.Rows(GridView1.SelectedIndex).Cells(0).FindControl("DropDownList1"), DropDownList).SelectedValue = 0 Then
            For i As Integer = 3 To 33
                GridView1.Rows(GridView1.SelectedIndex).Cells(i).Text = 0
            Next
        End If
        If CType(GridView1.Rows(GridView1.SelectedIndex).Cells(0).FindControl("DropDownList1"), DropDownList).SelectedValue = 1 Then
            For i As Integer = 3 To 33
                GridView1.Rows(GridView1.SelectedIndex).Cells(i).Text = 1
            Next
        End If

 End Sub

I don't think that the subroutine is even called once. I am not sure how to do it without using any other control like a button or a link. I want it to be such that when the user selects the list item, the subroutine is called.

Please let me know how to achieve this. Thanks for your help.

Sorry, I forgot to set AutoPostBack to true. 

                                    <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">

 I can finally make all the rows 0 or 1 using the following code;

    Protected Sub DropDownList1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)
        Dim ddl As DropDownList = DirectCast(sender, DropDownList)
        Dim row As GridViewRow = TryCast(ddl.NamingContainer, GridViewRow)
        Dim i As Int16
        If row IsNot Nothing Then
            If CType(row.FindControl("DropDownList1"), DropDownList).SelectedValue = "0" Then
                For i = 3 To 33
                    row.Cells(i).Text = 0
                Next
            ElseIf CType(row.FindControl("DropDownList1"), DropDownList).SelectedValue = "1" Then
                For i = 3 To 33
                    row.Cells(i).Text = 1
                Next

            End If
        End If
    End Sub

But I still have to figure out how to edit all the columns in a row, i.e. if the user selects "Edit" from the dropdownlist, all the columns in that specific row should become editable. Also, I would like to update these changes in the database. How am I supposed to do that???

In my experience, I don't put "Edit" option in the DropDownList. I use a button in each row and specify its CommandName "Edit". First of all I create EditItemTemplate in the GridView. When I click the edit button, the GridView will be in its edit mode. If you want to update the database, you just put a button with CommandName "Update" in your EditItemTemplate. Your GridView would look like the following,

<asp:GridView ID="GridView1" runat="server" OnRowCommand="GridView1_RowCommand"...>

<ItemTemplate>

...

</ItemTemplate> 

 <EditItemTemplate>

...

</EditItemTemplate>

</asp:GridView>

You write your update procedure in GridView1_RowCommand().

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)

{

switch(e.CommandName)

{

case "Update":

....

}

}

Hi,

  Thanks a lot. It worked for me....