Show data from database with dropdown list data

      var tbl = from p in db.tableName                         

                              select p;     

                  if(tbl != null)

{                  

                 GridView1.DataSource = tbl;             

                GridView1.DataBind();

}

else

{        

                 GridView1.DataSource = "No data found";             
                GridView1.DataBind();

}