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Why can I not Find The Control

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This is a migrated thread and some comments may be shown as answers.
Perry
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Perry asked on 11 Jun 2018, 03:11 PM

I have a simple RadGrid with 2 columns. I have set AllowGenerateColumns to false but I am using the NeedData Source to populate the Grid.   One column is a Text box and the other is a dropdown list.  I have nor problems showing the Grid with the data and I can add new records.
Here is my ASPX code to for this Grid:

<telerik:RadGrid ID="gvOrgContacts" runat="server"
                                AutoGenerateColumns="false"
                                OnNeedDataSource="gvOrgContacts_NeedDataSource"
                                AllowSorting="true"
                                AllowPaging="false"
                                AllowAutomaticDeletes="true"
                                AllowFilteringByColumn="false"
                                OnItemCreated="gvOrgContacts_ItemCreated"
                                OnItemInserted="gvOrgContacts_ItemInserted"
                                OnPreRender="gvOrgContacts_PreRender"
                                OnInsertCommand="gvOrgContacts_InsertCommand"
                                OnItemDataBound="gvOrgContacts_ItemDataBound"
                                OnUpdateCommand="gvOrgContacts_UpdateCommand"
                                OnDeleteCommand="gvOrgContacts_DeleteCommand"
                                OnItemCommand="gvOrgContacts_ItemCommand"
                                Skin="Default"
                                Visible="false">
                                <HeaderStyle CssClass="GridHeader" />
                                <PagerStyle Mode="NextPrevNumericAndAdvanced" />
                                <MasterTableView AutoGenerateColumns="false" DataKeyNames="ContactID" CommandItemDisplay="Top" InsertItemPageIndexAction="ShowItemOnCurrentPage">
                                    <Columns>
                                        <telerik:GridEditCommandColumn></telerik:GridEditCommandColumn>
                                        <telerik:GridBoundColumn DataField="ContactID" HeaderText="ContactID" ReadOnly="true" UniqueName="ContactID" AllowFiltering="false"
                                            DataType="System.Int16" DefaultInsertValue="" Exportable="false" Visible="false">
                                        </telerik:GridBoundColumn>
                                        <telerik:GridBoundColumn DataField="Contact" HeaderText="Contact" SortExpression="Contact" UniqueName="Contact"></telerik:GridBoundColumn>
                                        <telerik:GridTemplateColumn UniqueName="ContactTemplateColumn" HeaderText="Contact Type">
                                            <ItemTemplate>
                                                <asp:Label ID="Contact" runat="server"
                                                    Text='<%# DataBinder.Eval(Container.DataItem, "Contact") %>'>
                                                </asp:Label>
                                            </ItemTemplate>
                                            <EditItemTemplate>
                                                <asp:TextBox ID="txtContact" runat="server"></asp:TextBox>
                                            </EditItemTemplate>
                                            <EditItemTemplate>
                                                <asp:DropDownList ID="ddlContacts" runat="server" DataTextField="ContactType" DataValueField="ContactTypeID"></asp:DropDownList>
                                            </EditItemTemplate>
                                        </telerik:GridTemplateColumn>
                                        <telerik:GridButtonColumn ConfirmText="Delete this contact?" ConfirmDialogType="RadWindow"
                                            ConfirmTitle="Delete" ButtonType="ImageButton" ImageUrl="~/Images/filterCancel.gif" Text="Delete" CommandName="Delete" Exportable="false" />
                                    </Columns>
                                </MasterTableView>
                            </telerik:RadGrid>

 

And Here is my Code behind

protected void gvOrgContacts_UpdateCommand(object sender, GridCommandEventArgs e)
        {
            if (e.Item is GridEditableItem && e.Item.IsInEditMode)
            {
                GridEditableItem editedItem = e.Item as GridEditableItem;
                string contactID = editedItem.OwnerTableView.DataKeyValues[editedItem.ItemIndex]["ContactID"].ToString();
                int intContactID = Convert.ToInt16(contactID);
 
                using (BackgroundInvEntities db = new BackgroundInvEntities())
                {
                    var results = db.T_Contacts.Where(a => a.ContactID == intContactID).ToList();
                    DropDownList ddlContact = (DropDownList)editedItem.FindControl("ddlContacts") as DropDownList;
                    int intContactType = Convert.ToInt32(ddlContact.SelectedValue);
                    TextBox txtContacts = (TextBox)editedItem.FindControl("txtContact") as TextBox;
                    string strContact = txtContacts.Text;
                     
                    results[0].ContactTypeID = intContactType;
                    results[0].Contact = strContact;
                    DbContext.SaveChanges();
                    gvOrgContacts.MasterTableView.ClearEditItems();
                    gvOrgContacts.Rebind();
 
                }
            }
 
             
        }

 

I can retrieve the selected value of the DropDownList but when the code line to set the value of the strContact runs I get an unhandled exception. "JavaScript runtime error: ObjectReference not set to an instance of an object.
When I inspect the TextBox txtContacts it does not show a web control it shows as null.

Any one have any ideas as to why this web control is not being found?

 

 

 

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Perry
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