how to solve this error in datagridview

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C#

hi friends. i have 2 form in my windows application program. when i click on first form button i go to the second form. in second form i have a datagridview that it fill with values from database. this datagridview show all data(rows) that i want and one row more that it is empty after last row. and this create an error for me with this text-->"object reference not set to an instance of an object". in my code i used foreach statement like this.

foreach (DataGridViewRow row in dataGridView1.Rows)
{
//some codes for doing some jobs on cells
}

how can i solve this problem.
and delete last empty row

thank you.