RadGrid User Control Issue

[Mahesh Babu]

Hi,

I am trying to create user control which has radgrid and sqldatasource controls. I added radgrid to a a new ascx as given below:

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="WebUserControl.ascx.cs"
    Inherits="Controls_WebUserControl"  %>
<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>

<telerik:RadGrid AutoGenerateColumns="False" ID="RadGrid1" DataSourceID="SqlDS" AllowFilteringByColumn="true"
    AllowPaging="True" AllowSorting="True" runat="server"  OnPageIndexChanged="RadGrid1_PageIndexChanged" Skin="Office2007" PageSize="10" EnableViewState="true">
    <PagerStyle Mode="NextPrevNumericAndAdvanced" />
    <MasterTableView>
        <PagerStyle Mode="NextPrevNumericAndAdvanced" />
        <Columns>
            <telerik:GridBoundColumn DataField="RollNo" SortExpression="RollNo" HeaderButtonType="TextButton" ShowSortIcon="true"
                AutoPostBackOnFilter="false">
            </telerik:GridBoundColumn>
            <telerik:GridBoundColumn DataField="StudentName" SortExpression="StudentName" HeaderButtonType="TextButton"
                ShowSortIcon="true">
            </telerik:GridBoundColumn>
            <telerik:GridBoundColumn DataField="Address" SortExpression="Address" HeaderButtonType="TextButton" ShowSortIcon="true">
            </telerik:GridBoundColumn>
        </Columns>
    </MasterTableView>
</telerik:RadGrid>
<asp:SqlDataSource ID="SqlDS" ConnectionString="<%$ ConnectionStrings:cemiConnectionString %>"
    ProviderName="System.Data.SqlClient" SelectCommand="SELECT * FROM Student" runat="server" />


When I am changing pages using 1,2,3, it is working fine. But, when I click on pager images like next,previous,first, last is generating the following error:

Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentException: Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

If the move the raggrid and sqldatasource to a new web page(default.aspx), everything is working fine.
Can I know the issue why it is generating error when I am adding it to user control???

Thanks,
Mahesh

[Princy]

Hello Mahesh,

Check if you are calling DataBind() or Rebind() method for the grid in the PageLoad event. If so, try adding these methods within some condition check based on your scenario. If not, try setting the EnableEventValidation attribute in the page Directive of your aspx page where the user control is added to False as shown below:
aspx:

<%@ Page Language="C#" AutoEventWireup="true" EnableEventValidation="false" CodeFile="Default.aspx.cs" Inherits="_Default" %>

Thanks
Princy.

[Luis]

hi,
i solved the problem as i read in one post in the forum

binding the grid in the oninit(C#), init(VB) event

Protected Sub RadGrid1_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles RadGrid1.Init
    RadGrid1.DataBind()
End Sub


thanks to "Hans Notelteirs"

[Rohan]

Hi all,
i want to create User control using rad grid ,the rad grid is generated dynamically ...... please provide any link or document or example.
Thank You .

[Shinu]

Hi,

I'm not quite sure about your requirement. Please take a look into the following code snippet I tried to create a UserControl using Programmatic RadGrid.

page.ascx

<asp:PlaceHolder ID="pl" runat="server"></asp:PlaceHolder>
<asp:SqlDataSource ID="SqlDataSource1" ConnectionString="<%$ConnectionStrings:NorthwindConnectionString3%>" runat="server" SelectCommand="select top 5 * from Employees" ></asp:SqlDataSource>

page.ascx.cs:

protected void Page_Load(object sender, EventArgs e)
{
     RadGrid grid = new RadGrid();
     grid.ID = "RadGrid1";
     grid.AutoGenerateEditColumn = true;
     grid.DataSourceID = "SqlDataSource1";
     grid.AutoGenerateColumns = false;
     grid.MasterTableView.CommandItemDisplay = GridCommandItemDisplay.Top;
     grid.MasterTableView.AllowMultiColumnSorting = true;
     GridBoundColumn boundColumn = new GridBoundColumn();
     boundColumn.DataField = "EmployeeID";
     boundColumn.HeaderText = "EmployeeID ID";
     grid.MasterTableView.Columns.Add(boundColumn);
     this.pl.Controls.Add(grid);
}

Please check this Help Documentation to know about loading User Control with RadGrid at Runtime.

Thanks,
Shinu.

[Rafael]

Is It.. tks.. C#

protected void RadGrid1_Init(object sender, EventArgs e)
{
RadGrid1.DataBind();
}