How to get the column names by passing the table name in ASP.NET and display that records in gridview

private static string[] GetAllTableNames()
       {
           SqlConnection con = new SqlConnection(@"user id=sa;password=ssa;database=Mohan;data source=PCTH101\PCTH101");
           SqlCommand cmd = new SqlCommand("select name from sys.tables", con);
           SqlDataAdapter da = new SqlDataAdapter(cmd);
           DataTable dt = new DataTable();
           da.Fill(dt);
           return dt.AsEnumerable().Select(k => k[0] + "").ToArray();
       }