This example shows how to create Nested GridView In Asp.Net Using C# And VB.NET With Expand Collapse Functionality. I have used JavaScript to Create Expandable Collapsible Effect by displaying Plus Minus image buttons. Customers and Orders Table of Northwind Database are used to populate nested GridViews. Drag and place SqlDataSource from toolbox on aspx page and configure and choose it as datasource from smart tags Go to HTML source of page and add 2 TemplateField in <Columns>, one as first column and one as last column of gridview. Place another grid in last templateField column. Markup of page after adding both templatefields will like as shown below. HTML SOURCE 1: < asp:GridView ID ="gvMaster" runat ="server" 2: AllowPaging ="True" 3: AutoGenerateColumns ="False" 4: DataKeyNames ="CustomerID" 5: DataSour
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