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08.01.2008 at 12:10PM PDT, ID: 23615123
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9.3

TemplateField Losing Controls When Using GridView.Columns.Insert

Asked by perksdev in Programming for ASP.NET, Microsoft Visual C#.Net, WebApplications

Tags:

I have a GridView (UserSalesGridView) which has a few template fields and a few bound fields coded into the ASPX page.  I am also dynamically adding bound fields to the grid with GridView.Columns.Insert.  This works fine on the first time the page loads, but not after a PostBack.  When I use e.Row.FindControl to hide/show controls in one of the template fields during UserSalesGridView_RowDataBound, I get "Object reference not set to an instance of an object" because it can't find any of the controls inside the template fields.  I do not have this problem when I use GridView.Columns.Add, but I need the dynamically added fields to be to the left of two of the template fields coded into the ASPX page.  Does anyone know how I can show/hide these controls in the template field?  Or why the controls in the template fields' controls are not found by e.Row.FindControl?Start Free Trial 
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<!--ASPX PAGE-->
<asp:GridView ID="UserSalesGridView" runat="server" AutoGenerateColumns="False"
	EmptyDataText="[No Sales Units Defined]" 
	OnRowEditing="UserSalesGridView_RowEditing" OnRowUpdating="UserSalesGridView_RowUpdating" OnRowCancelingEdit="UserSalesGridView_RowCancelingEdit"
	EnableViewState="true" DataKeyNames="ID" OnRowUpdated="UserSalesGridView_RowUpdated"
	 OnRowDataBound="UserSalesGridView_RowDataBound">
	<Columns>
	   <asp:TemplateField>
				<ItemTemplate>
					<asp:CheckBox
						ID="SelectedCheckBox"
						runat="server" />
				</ItemTemplate>
			</asp:TemplateField>
		<asp:BoundField DataField="EmployeeID" HeaderText="[EmployeeID]" />
		<asp:BoundField DataField="ClientSalesUnitID" HeaderText="[Sales Unit ID]" />
		<asp:BoundField DataField="Quantity" HeaderText="[Quantity]" />
		<asp:BoundField DataField="ActivityDate" HeaderText="[Activity Date]" ReadOnly="true" />
	   <asp:TemplateField HeaderText="[Status]">
				<ItemTemplate>
					<div class="actionCell">
						<asp:Image ID="ApprovedImage" ImageUrl="/PerksPlusV2/App_Grafx/gridicons/icon_approved.png" runat="server" Visible="false" />
						<asp:Image ID="DeclinedImage" ImageUrl="/PerksPlusV2/App_Grafx/gridicons/icon_declined.png" runat="server" Visible="false" />
						<asp:Image ID="AwardedImage" ImageUrl="/PerksPlusV2/App_Grafx/gridicons/icon_awarded.png" runat="server" Visible="false" />
						<asp:Image ID="PendingImage" ImageUrl="/PerksPlusV2/App_Grafx/gridicons/icon_pending.png" runat="server" Visible="false" />
					</div>
				</ItemTemplate>
			</asp:TemplateField>
	   <asp:TemplateField HeaderText="[Actions]">
			<ItemTemplate>
				<div class="actionCell">
					<asp:LinkButton 
						ID="DeleteRowLinkButton" 
						runat="server" 
						Text="[Delete]" 
						CommandArgument='<%# Eval("ID") %>'
						OnCommand="DeleteRowLinkButton_Command">
					</asp:LinkButton>
					<asp:HyperLink 
						ID="EditRowLinkButton" 
						runat="server" 
						Text="[Edit]"
						NavigateUrl='<%# "ActivityUnitDetails.aspx?UnitId=" + Eval("ID") %>'>
					</asp:HyperLink>
				</div>
			</ItemTemplate>
		</asp:TemplateField>
	</Columns>
</asp:GridView>
 
//--------------------------------------------------------
//dynamically add boundfields to gridview
foreach (CustomInputDefinition definition in definitions)
{
	if (definition.ViewInApprovalGrid.HasValue && definition.ViewInApprovalGrid.Value)
	{
		string alias = definition.Name;
		string id = definition.Id.ToString();
		//create temporary bound field to hold this custom field's data
		BoundField tmpBoundField = new BoundField();
		tmpBoundField.DataField = alias;
		tmpBoundField.HeaderText = alias;
		//add this to the gridview before the status and actions columns
		UserSalesGridView.Columns.Insert(UserSalesGridView.Columns.Count - 2, tmpBoundField);
	}
}
 
 
//--------------------------------------------------------
protected void UserSalesGridView_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                int unitStatus = Convert.ToInt32(((DataRowView)(e.Row.DataItem)).Row["Status"]);
                string pointsAwarded = ((DataRowView)(e.Row.DataItem)).Row["PointsAwarded"].ToString();
                if (!String.IsNullOrEmpty(pointsAwarded))
                {
                    ((System.Web.UI.WebControls.Image)(e.Row.FindControl("AwardedImage"))).Visible = true;
                }
                else
                {
                    if (unitStatus == (int)SalesUnitSoldByUserStatusEnum.Approved)
                        ((System.Web.UI.WebControls.Image)(e.Row.FindControl("ApprovedImage"))).Visible = true;
                    else if (unitStatus == (int)SalesUnitSoldByUserStatusEnum.Declined)
                        ((System.Web.UI.WebControls.Image)(e.Row.FindControl("DeclinedImage"))).Visible = true;
                    else
                        ((System.Web.UI.WebControls.Image)(e.Row.FindControl("PendingImage"))).Visible = true;
                }
            }
        }
[+][-]08.04.2008 at 08:27AM PDT, ID: 22153243

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About this solution

Zones: Programming for ASP.NET, Microsoft Visual C#.Net, WebApplications
Tags: ASP.NET (C#)
Sign Up Now!
Solution Provided By: prairiedog
Participating Experts: 1
Solution Grade: A
 
 
[+][-]08.04.2008 at 10:20AM PDT, ID: 22154195

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