I am getting an error for this c# code
if (radioAll.Checked)
{
SqlDataSource DataSource2 = new SqlDataSource();
DataSource2.ID = "SqlDataSource2";
this.Page.Controls.Add(DataSource2);
DataSource2.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["SEP_Project_NewConnectionString2"].ConnectionString;
DataSource2.SelectCommand = "SELECT courseNo,title from Course";
gridview_modules.DataSource = DataSource2;
gridview_modules.DataBind();
}
The error is as follows
The connection string is ok. How to fix this error?