How to check if a selected row in a datagridview is empty(has no item)

Question

Hey! First time poster here, first of all I wasn't sure if this is the right place to post but, how would I accomplish this? I've been trying the following:

            if (dgvClient.SelectedRows.Count > 0)

            {

                DataGridViewRow currentRow = dgvClient.SelectedRows[0];

                if (currentRow.Cells.ToString() != String.Empty)

                {

                    //The code that will be here will open a form

                }

                else

                {

                    MessageBox.Show("Select a non null row");

                }

            }

However, it doesn't appear to be working, and I'm out of ideas :/

Thanks for any help, 
Ari