Prevent grid flickering using Ajax?

[Mircea]

Hello,

I have a RadGrid and when adding anew record, there are some of cascade dropdown. Once a selection is made in "Record Type", then the dropdown below, "Sub-Type" rebinds to the data source and displays only relevant records.

Code below (it works correctly, I am just adding it as a reference to understand the issue I am experiencing):

Protected Sub RecordType_SelectedIndexChanged(ByVal sender As Object, ByVal e As DropDownListEventArgs)
    Dim combo As RadDropDownList = TryCast(sender, RadDropDownList)
    Dim container As GridEditableItem = TryCast(combo.NamingContainer, GridEditableItem)

    Dim workProductCombo As RadDropDownList = TryCast(container.FindControl("SubTypeDropDown"), RadDropDownList)
    If Not workProductCombo Is Nothing Then
      SqlDataSource7.SelectCommand = "SELECT [Sub_Type] FROM [Record_Sub_Type] WHERE [id]=(SELECT [ID] from [Record_Type1] where [Record_Type]='" & combo.SelectedValue & "') OR [ID]=0 ORDER BY [Sub_Type] ASC"
        SqlDataSource7.DataBind()

      workProductCombo.DataBind()
      workProductCombo.ClearSelection()
    End If

   
  End Sub

Action on grid when adding new record:

 

Everything works correctly but.... grid is flickering when dropdown selection triggers a data source rebind. How to avoid this? I tied to "ajaxify" the grid as follows, but no result.

  <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
    <AjaxSettings>
      <telerik:AjaxSetting AjaxControlID="RadGrid1">
        <UpdatedControls>
          <telerik:AjaxUpdatedControl ControlID="RadGrid1" LoadingPanelID="RadAjaxLoadingPanel1"></telerik:AjaxUpdatedControl>
        </UpdatedControls>
      </telerik:AjaxSetting>
    </AjaxSettings>
  </telerik:RadAjaxManager>

 

 

[Attila Antal]

Since you have a formal support ticket submitted for the same issue, I suggest that we investigate the problem there, and once we found the solution we share it in the forum as well.