getting Check box value from datagrid view

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C#2.0

C#

hello every body,,

i add a check box column in datagrid view.
i want user should check only one check box (i.e select one record at a time)
i used cell click event
private void myDataGridView_CellClick(object sender, DataGridViewCellEventArgs e)
{

DataGridViewCheckBoxCell Check = (DataGridViewCheckBoxCell)myDataGridView.Rows[e.RowIndex].Cells[0];
if (Check.Value != null)
{
if (Check.Value == "True")
{
int r = e.RowIndex;
}
}
else
return;
}
but as i select/tick any check box it take value as null why?
i set the true value to True & FalseValue to false of datagrid view's column of CheckBox.

if u know this plz tell me