How do I get the row and column of the current cell in my datagrid

You can use the CurrentCell property of the DataGrid.

private void button1_Click(object sender, System.EventArgs e)
{
	intcolNum = dataGrid1.CurrentCell.ColumnNumber;
	int rowNum = dataGrid1.CurrentCell.RowNumber;
	object cellValue = dataGrid1[rowNum, colNum];
	string s = string.Format('row={0}  col={1}  value={2}', rowNum, colNum, cellValue);
	MessageBox.Show(s);
}