TargetInvocationException: Exception has been thrown by the target of an invocation. on Data Bind
I'm trying to bind a GridView to datasource on RowEditing event, but it throws an exception:
[TargetInvocationException: Exception has been thrown by the target of an invocation.] Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control.
lblackout = EXMailbox.GetBlackouts();
BlackoutGridView.DataSource=lblackout;
protected void BlackoutGridView_RowEditing(object sender, GridViewEditEventArgs e)
{
BlackoutGridView.EditIndex = e.NewEditIndex;
BlackoutGridView.DataSource = lblackout; //Throws exception here.
BlackoutGridView.DataBind();
}
<asp:GridView ID="BlackoutGridView" runat="server" AutoGenerateColumns="False"
OnRowDeleting="BlackoutGridView_RowDeleting"
OnRowEditing="BlackoutGridView_RowEditing"
onrowcancelingedit="BlackoutGridView_RowCancelingEdit">
<Columns>
<asp:BoundField DataField="BlackoutId" HeaderText="BlackoutId" >
</asp:BoundField>
<asp:TemplateField HeaderText="Region">
<EditItemTemplate>
<asp:DropDownList ID="DropDownList11" runat="server" Text='<%# Bind("Region") %>'
DataSourceID="lblackout" DataTextField="Region" DataValueField="Region"></asp:DropDownList>
<asp:ObjectDataSource ID="lblackout" runat="server" SelectMethod="GetDataItem"
TypeName="Exchange.MailboxMove.WebUI.BlackoutScreen"></asp:ObjectDataSource>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("Region") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField HeaderText="Server" DataField="Server">
</asp:BoundField>
<asp:BoundField HeaderText="From Date" DataField="StartDateTime"
DataFormatString="{0:D}">
</asp:BoundField>
<asp:BoundField HeaderText="To Date" DataField="EndDateTime"
DataFormatString="{0:D}">
</asp:BoundField>
<asp:BoundField HeaderText="From Time" DataField="StartDateTime"
DataFormatString="{0:t}">
</asp:BoundField>
<asp:BoundField HeaderTe开发者_运维技巧xt="To Time" DataField="EndDateTime"
DataFormatString="{0:t}">
</asp:BoundField>
<asp:CheckBoxField HeaderText="IsWeekly" DataField="IsWeekly">
</asp:CheckBoxField>
<asp:CommandField DeleteText="Cancel" HeaderText="Action"
ShowDeleteButton="True" ShowEditButton="True" ShowHeader="True" >
</asp:CommandField>
as per your code, i think you missed the DataValue Field for the Gridview.
THis is the Sample from MSDN, How to Bind the Dropdownlist
<asp:DropDownList ID="InsertCategoryDropDownList"
DataSourceID="CategoriesDataSource"
DataTextField="CategoryName"
DataValueField="CategoryID"
RunAt="Server" />
Without DataValue Field, Row Editing and other Event will not Perform the Logic. I hope i helped you. You can also check in MSDN For SqlDatasource http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.sqldatasource.aspx
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