private void CreateNewDataRow()
   {
       // Use the MakeTable function below to create a new table.
       DataTable table;
       table = MakeNamesTable();

       // Once a table has been created, use the 
       // NewRow to create a DataRow.
       DataRow row;
       row = table.NewRow();

       // Then add the new row to the collection.
       row["fName"] = "John";
       row["lName"] = "Smith";
       table.Rows.Add(row);
   
       foreach(DataColumn column in table.Columns)
           Console.WriteLine(column.ColumnName);
       dataGrid1.DataSource=table;
   }

   private DataTable MakeNamesTable()
   {
       // Create a new DataTable titled 'Names.'
       DataTable namesTable = new DataTable("Names"); 

       // Add three column objects to the table.
       DataColumn idColumn = new  DataColumn();
       idColumn.DataType = System.Type.GetType("System.Int32");
       idColumn.ColumnName = "id";
       idColumn.AutoIncrement = true;
       namesTable.Columns.Add(idColumn);

       DataColumn fNameColumn = new DataColumn();
       fNameColumn.DataType = System.Type.GetType("System.String");
       fNameColumn.ColumnName = "Fname";
       fNameColumn.DefaultValue = "Fname";
       namesTable.Columns.Add(fNameColumn);

       DataColumn lNameColumn = new DataColumn();
       lNameColumn.DataType = System.Type.GetType("System.String");
       lNameColumn.ColumnName = "LName";
       namesTable.Columns.Add(lNameColumn);

       // Create an array for DataColumn objects.
       DataColumn [] keys = new DataColumn [1];
       keys[0] = idColumn;
       namesTable.PrimaryKey = keys;

       // Return the new DataTable.
       return namesTable;
   }