I have a ComboBox that utilizes LoadOnDemand. Everything works fine if the user types in their input, waits for the combo box to finish loading, then submits the page. But if the user changes their input before the comboBox has finished loading and then tries to submit the page, the following error appears:

RadComboBox: load on demand callback error. Press Enter for more information.

Then when you click OK, it redirects you to a page that says that you may need to use an ExternalCallBackPage. I have tried it with the ExternalCallBackPage and the same thing happens. Is there any way around this issue?

Hi, all i want to do, is to know if  a checkbox is checked or not in every row of my grid, with the grid of visualstudio 2005 i ran this code when i clicked a button

    Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button2.Click
        For index As Integer = 0 To Me.GridView1.Rows.Count - 1
            Dim Valida As CheckBox = CType(Me.GridView1.Rows(index).FindControl("ColSel"), CheckBox)
            If Valida.Checked Then
               'do something
            End If
        Next
    End Sub

in aspx i define the checkbox column like this

<telerik:GridTemplateColumn UniqueName="RevCol">

<ItemTemplate>

<asp:CheckBox ID="CheckBox1" runat="server" />

</ItemTemplate>

<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" />

</telerik:GridTemplateColumn>

then i convert to vb this code, than you posted in some thread

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e) 
    { 
                foreach (GridDataItem item in RadGrid1.MasterTableView.Items) 
                { 
                    CheckBox chk = (CheckBox)item.FindControl("CheckBox1"); 
                    if (chk.Checked) 
                    { 
                        Label lbl = (Label)item["Cool"].FindControl("Label1"); 
                        lbl.Text = DropDownList1.Text; 
                    } 
                }          
    } 

this is the result

Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button2.Click
    For

Each item As Telerik.Web.UI.GridDataItem In RadGrid1.MasterTableView.Items

        Dim chk As CheckBox = CType(item.FindControl("CheckBox1"), CheckBox)

        If chk.Checked  Then

            'do something

        End If

    Next

End Sub

this code is running, but even with all rows checked in the command IF allways the result is false, can you help me please, what i doing wrong.

sorry for my english, i still working on it

Thanks in advanced...