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[Solved] There was an error rendering the control.

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ComboBox

This is a migrated thread and some comments may be shown as answers.

Phil asked on 03 Jan 2010, 01:26 AM

Hi:

I have a business layer that is returning Value and Text in a DataTable for all my combo-boxes in my application.

    
            <asp:ObjectDataSource ID="ObjectDataSource1" runat="server"  
        
                SelectMethod="AccountNumber" TypeName="Aplic.BLL.DropDowns"> 
        
            </asp:ObjectDataSource> 
        
            <telerik:RadComboBox ID="RadComboBox1" runat="server"  
        
                DataSourceID="ObjectDataSource1" DataTextField="Text" DataValueField="Value"> 
        
            </telerik:RadComboBox>

In the designer it is always displaying:
RadComboBox1
There was an error rendering the control.
Text is neither a DataColumn nor a DataRelation for table.
How can I solve this design time issue.
Phil

5 Answers, 1 is accepted

answered on 08 Jan 2010, 01:02 AM

Hi
I have a little demo. The web form:

    
            <%@ Page Language="C#" %> 
        
            <%@ Register assembly="Telerik.Web.UI" namespace="Telerik.Web.UI" tagprefix="telerik" %> 
        
            <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
        
            <script runat="server"> 
        
            </script> 
        
            <html xmlns="http://www.w3.org/1999/xhtml"> 
        
            <head runat="server"> 
        
                <title> Combo Box Render Problem</title> 
        
            </head> 
        
            <body> 
        
                <form id="form1" runat="server"> 
        
                <div> 
        
                    <telerik:RadScriptManager ID="RadScriptManager1" Runat="server"> 
        
                    </telerik:RadScriptManager> 
        
                    <telerik:RadComboBox ID="radcomboboxDisplay" runat="server" Width="300px"  
        
                        AutoPostBack="True" HighlightTemplatedItems="True"  
        
                        CausesValidation="False"  
        
                        Skin="Office2007" DataSourceID="dropdownDataSource" 
        
                        DataTextField="Text" DataValueField="Value"> 
        
                        <CollapseAnimation Type="OutQuint" Duration="200"></CollapseAnimation> 
        
                    </telerik:RadComboBox> 
        
                    <asp:ObjectDataSource ID="dropdownDataSource" runat="server"  
        
                        EnableCaching="True" TypeName="DropDowns" SelectMethod="dd"> 
        
                    </asp:ObjectDataSource> 
        
                </div> 
        
                </form> 
        
            </body> 
        
            </html>

Class in the app_code dir:

    
            using System; 
        
            using System.Collections.Generic; 
        
            using System.Linq; 
        
            using System.Web; 
        
            using System.Data; 
        
            public class DropDowns 
        
            { 
        
                public DataTable dd() 
        
                { 
        
                    DataTable _return = new DataTable(); 
        
                    _return.Columns.Add("Value", typeof(string)); 
        
                    _return.Columns.Add("Text", typeof(string)); 
        
                    _return.Rows.Add(new Object[] { "V1", "Text 1" }); 
        
                    _return.Rows.Add(new Object[] { "V2", "Text 2" }); 
        
                    _return.Rows.Add(new Object[] { "V3", "Text 3" }); 
        
                    return _return; 
        
                } 
        
            }

View in VS...
Phil