I have a treeview dynamically populated from database based on the value in the dropdown. I am trying to achieve this by firing the populatenode on selected event changed event. However "Unable to cast object of type 'System.EventArgs' to type 'System.Web.UI.WebControls.TreeNode
EventArgs". All I am trying to do is to obtain the courseID from dropdown.Selectedvalue, convert it into an integer and display only the nodes associated with that particular value. Please help!
Here's my code:
Aspx page code
<form id="form1" runat="server">
<div>
<asp:DropDownList ID="DropDownList1" runat="server"
DataSourceID="SqlDataSource1" DataTextField="Coursename"
DataValueField="Coursename" style="width: 77px"
OnSelectedIndexChanged="PopulateNode" AutoPostBack="True" Appen ...
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