C# Datagridview selected row move another datagridview

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C#3.0

C#

SQL

Hi All, I have two datagridview as 2 and 3, I just want to move selected row from 2nd datagridview to 3rd datagridview. Below is my cod segment, my problem is, I want to select selected row index value to here dataGridView2.Rows[??] and next available new row index value to here dataGridView3.Rows[??]. Please help me. Thanks for reading.

int n = dataGridView3.Rows.Add();
dataGridView3.Rows[0].Cells[0].Value = dataGridView2.Rows[0].Cells[0].Value;
dataGridView3.Rows[0].Cells[1].Value = dataGridView2.Rows[0].Cells[1].Value;
dataGridView3.Rows[0].Cells[2].Value = dataGridView2.Rows[0].Cells[2].Value;