merge data columns in datagridviwe

void Main()
{
    DataTable table1 = new DataTable();
    table1.Columns.Add("Id",typeof(string),null);
    table1.Columns.Add("Name",typeof(string),null);
    table1.Rows.Add("1","Name one");
    table1.Rows.Add("2","Name two");
    table1.Rows.Add("3","Name three");
    
    DataTable table2 = new DataTable();
    table2.Columns.Add("IdName",typeof(string),null);
    
    table1.AsEnumerable().Select (
	row => {DataRow mRow = table2.NewRow();
	mRow["IdName"]= string.Format("{0}: {1}",
		row.Field<string>("Id"),
		row.Field<string>("Name"));
	return mRow;}).CopyToDataTable(table2,
		LoadOption.OverwriteChanges);
}

//table1
//Id Name 
//1 Name one 
//2 Name two 
//3 Name three 
//
//table2
//IdName 
//1: Name one 
//2: Name two 
//3: Name three 
//</string></string>