How to use DataBinder in RadButton ImageUrl Property?

[Ashkan]

Hi.
i need to ImageUrl with databinder in radgrid GridTemplateColumn:
MyCode in aspx:

<telerik:GridTemplateColumn HeaderText="Need Call"
                            ItemStyle-HorizontalAlign="Center"  >
    <ItemTemplate>
        <telerik:RadToolTip ID="RadToolTipCall" runat="server" TargetControlID="chkNeedCall" AutoCloseDelay="10000"
                            RelativeTo="Element" Position="MiddleRight">
            <%# Eval("UsernameNeedCall") %>
        </telerik:RadToolTip>
        <telerik:RadButton ID="chkNeedCall" runat="server" Width="22px" Height="22px" ToggleType="CheckBox" ButtonType="LinkButton" CommandArgument='<%# Eval("Id") %>' AutoPostBack="True" OnCommand="btnNeedCall_Click">
           <Image EnableImageButton="True" ImageUrl='<%# Eval("NeedCall") %>' IsBackgroundImage="True"></Image>
        </telerik:RadButton>
    </ItemTemplate>
</telerik:GridTemplateColumn>

C# Code:

protected void gridShow_NeedDataSource(object sender, Telerik.Web.UI.GridNeedDataSourceEventArgs e)
{
    try
    {
        if (!e.IsFromDetailTable)
        {
            var db = new MyDataContext();
            var reciveMsg = db.TBL_ReceiverMsgs.ToList().Select((c, index) => new
            {
                RowIndex = index + 1,
                c.Id,
                c.Body,
                NeedCall = c.NeedCall ? "../Images/Sms/deliveryorange.png" : "../Images/Sms/deliveryok.png",
                NeedFollow = c.NeedFollow ? "../Images/Sms/deliveryorange.png" : "../Images/Sms/deliveryok.png",
                c.UsernameNeedCall

            });
            gridShowSms.DataSource = reciveMsg;
        }


    }
    catch (Exception)
    {
        lblException.Text = @"Error!!";
    }
}

Error in Line:<%# Eval("NeedCall") %>
how to fix the problem?
-------------------------------
I also have another problem:
when use the label or literal or div in GridTemplateColumn, radgrid columns mixed.
but MaxLength property!!! MaxLength does not allow mixed up columns.
The GridBoundColumn can not be used from RadToolTip!

<telerik:GridTemplateColumn HeaderText="Body" ItemStyle-HorizontalAlign="Center" >
    <ItemTemplate>
        <telerik:RadToolTip ID="RadToolTipBody" runat="server" TargetControlID="lblBody"
                            RelativeTo="Element" Position="Center" >
            <%# DataBinder.Eval(Container, "DataItem.Body") %>
        </telerik:RadToolTip>
        <div style="Width:100px" ID="lblBody" runat="server"><%# Eval("Body") %></div>
    </ItemTemplate>
</telerik:GridTemplateColumn>

TIA...

[Kostadin]

Hi Ashkan,

I noticed that you have add the image control in a RadButton. Note that when using an Evel expression it will looks for a filed in the RadButton and not in the RadGrid. Since RadButton does not have a DataBind method you can not use an Eval expression. Nevertheless a possible solution is to use a Hyperlink control. Regards your second question I am afraid I am not completely understand what is the issue which you are facing. Could you please elaborate a little bit more on the matter?

Regards,
Kostadin
Telerik