how to add image in gridview in vb.net

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VB

ASP.NET

sir. i have create a Datatable at runtime and bind with gridview. i want to add a image in datatable then bind with gridview. My code for example is there:-

Dim table As New DataTable

table.Columns.Add("Teacher", GetType(String))
       table.Columns.Add("Course", GetType(String))

table = GetTable(Teacher, Course)

GridView1.DataSource = table
      GridView1.DataBind()
      table.Dispose()

Public Function GetTable(ByVal Teacher As String, ByVal Course As String, ByVal Subject As String, ByVal Sem As String) As DataTable

cmd.commandtext="select * from Teacher"
     table.Rows.Add(Teacher, Course)

       Return table

   End Function

how can i add i image in new column in datatable and then bind with gridview?