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

Unable to cast object of type 'Telerik.Web.UI.GridDataItem'

1 Answer 811 Views

Grid

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

dingen asked on 01 Jan 2010, 03:17 AM

Hi

I am trying to push the go button in the edit mode and get a reference to the label lb1 but then get an error:
Unable to cast object of type 'Telerik.Web.UI.GridDataItem' to type 'Telerik.Web.UI.GridEditFormItem'

this is the code:

    
            <%@ Page Language="VB" AutoEventWireup="false" CodeFile="Itemcommand.aspx.vb" Inherits="Itemcommand" %> 
        
            <%@ 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"> 
        
            <html xmlns="http://www.w3.org/1999/xhtml"> 
        
            <head runat="server"> 
        
                <title></title> 
        
            </head> 
        
            <body> 
        
                <form id="form1" runat="server"> 
        
                <div> 
        
                    <telerik:RadScriptManager runat="server"> 
        
                    </telerik:RadScriptManager> 
        
                    <telerik:RadGrid ID="RadGrid1" runat="server"  GridLines="None" 
        
                         AutoGenerateColumns="False" 
        
                        ShowStatusBar="True" DataSourceID="SqlDataSource1"> 
        
                        <MasterTableView CommandItemDisplay="TopAndBottom" GridLines="None" DataKeyNames="EmployeeID" 
        
                            AllowFilteringByColumn="False" AllowSorting="True" DataSourceID="SqlDataSource1"> 
        
                            <Columns> 
        
                                <telerik:GridEditCommandColumn UniqueName="EditCommandColumn"> 
        
                                </telerik:GridEditCommandColumn> 
        
                                <telerik:GridBoundColumn UniqueName="EmployeeID" HeaderText="EmployeeID" DataField="EmployeeID" 
        
                                    DataType="System.Int32" ReadOnly="True" SortExpression="EmployeeID"> 
        
                                </telerik:GridBoundColumn> 
        
                                <telerik:GridBoundColumn DataField="City" HeaderText="City" SortExpression="City" 
        
                                    UniqueName="City"> 
        
                                </telerik:GridBoundColumn> 
        
                                <telerik:GridBoundColumn DataField="Country" HeaderText="Country" SortExpression="Country" 
        
                                    UniqueName="Country"> 
        
                                </telerik:GridBoundColumn> 
        
                            </Columns> 
        
                            <EditFormSettings EditFormType="Template"> 
        
                                <EditColumn UniqueName="EditCommandColumn1"> 
        
                                </EditColumn> 
        
                                <FormTemplate> 
        
                                    <table id="Table3" cellspacing="1" cellpadding="1" width="250" border="0" class="module"> 
        
                                        <tr> 
        
                                            <td> 
        
                                            </td> 
        
                                            <td> 
        
                                            </td> 
        
                                        </tr> 
        
                                        <tr> 
        
                                            <td> 
        
                                                Country: 
        
                                            </td> 
        
                                            <td> 
        
                                                <asp:TextBox ID="TextBox7" runat="server" Text='<%# Bind( "Country"  ) %>'> 
        
                                                </asp:TextBox> 
        
                                            </td> 
        
                                        </tr> 
        
                                        <tr> 
        
                                            <td> 
        
                                                City: 
        
                                            </td> 
        
                                            <td> 
        
                                                <asp:TextBox ID="TextBox8" runat="server" Text='<%# Bind( "City") %>' TabIndex="1"> 
        
                                                </asp:TextBox> 
        
                                            </td> 
        
                                        </tr> 
        
                                        <tr> 
        
                                            <td> 
        
                                                <asp:Button ID="btnTest" CommandName="test" text="go" runat="server" /> 
        
                                                <asp:Label ID="lb1" runat="server"></asp:Label> 
        
                                            </td> 
        
                                        </tr> 
        
                                    </table> 
        
                                    </table> 
        
                                </FormTemplate> 
        
                            </EditFormSettings> 
        
                        </MasterTableView> 
        
                    </telerik:RadGrid> 
        
                </div> 
        
                <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:nwindConnectionString %>" 
        
                    ProviderName="<%$ ConnectionStrings:nwindConnectionString.ProviderName %>" SelectCommand="SELECT * FROM [Employees]"> 
        
                </asp:SqlDataSource> 
        
                </form> 
        
            </body> 
        
            </html>

    
            Imports Telerik.Web.UI 
        
            Partial Class Itemcommand 
        
                Inherits System.Web.UI.Page 
        
                Protected Sub RadGrid1_ItemCommand(ByVal source As Object, ByVal e As Telerik.Web.UI.GridCommandEventArgs) Handles RadGrid1.ItemCommand 
        
                    If e.CommandName = "test" Then 
        
                        Dim edititem As GridEditFormItem = CType(e.Item, GridEditFormItem) 
        
                        'get reference to label lb1 
        
                        Dim str As Label = edititem.FindControl("lb1") 
        
                        str.Text = "hallo" 
        
                    End If 
        
                End Sub 
        
            End Class

any suggestions?
thanks
D

1 Answer, 1 is accepted

answered on 04 Jan 2010, 05:21 AM

Hello,

Try the following code snippet in order to access the EditForm.

VB:

    
            Protected Sub RadGrid1_ItemCommand(ByVal source As Object, ByVal e As GridCommandEventArgs) 
        
                If e.CommandName = "test" Then 
        
                    Dim edititem As GridEditFormItem = DirectCast(TryCast(e.Item, GridDataItem).EditFormItem, GridEditFormItem) 
        
                    'get reference to label lb1 
        
                    Dim str As Label = DirectCast(edititem.FindControl("lb1"), Label) 
        
                    str.Text = "hallo" 
        
                End If 
        
            End Sub

-Shinu.