foreach

If you are iterating through anything that is not a collection you should always use a for loop. It is a lot more efficient than a foreach loop.

foreach (System.Windows.Forms.DataGridViewRow objRow in objDataGridView.Rows) 
{ 

} 

Dim objRow As System.Windows.Forms.DataGridViewRow 
For Each objRow In objDataGridView.Rows 

Next objRow