Not getting the value of Data grid view's check box status

I have a grid view in which 3 columns have been added of check boxes .

but when I check the value as it check box is check or unchecked its every time gives false value .

My question is how can i get the state of checkboxes .

My code :

public string user_rights()

{

string msg = "";

int add = 0;

int delete = 0 ;

int view = 0 ;

foreach (DataGridViewRow dgvr1 in DGV.Rows)

{

if (dgvr1.Cells[0].Value.ToString() == "True")

{

add = add + 1;

}

if (dgvr1.Cells[1].Value.ToString() == "True")

{

delete = delete + 1;

}

if (dgvr1.Cells[2].Value.ToString() == "True")

{

view = view + 1;

}

if(add == 0 && delete == 0 && view == 0 )

{

msg = "Select atleast one user rights" ;

}

return msg;

}