void DataGridView_MouseDown(object sender, MouseEventArgs e)
        {
            DataGridView.HitTestInfo hittest = this.jcsGridControl1.DataGridView.HitTest(e.X, e.Y);
            if (hittest.Type == DataGridViewHitTestType.Cell && e.Button == MouseButtons.Right)
            {
                MessageBox.Show(hittest.RowIndex.ToString());
            }
 
        }

------解决方案--------------------
C# code
this.datagridview.SelectedRows[0]; //当前选中的行...

------解决方案--------------------
this.datagridview.SelectedRows[0];