How to use checkbox in DataGridView in Winfrom

   private void Dgdv_skjs_cellcontentclick (object sender, DataGridViewCellEventArgs e) {if (E.rowindex ! =-1) {Datagridviewcheckboxcell Checkcell_rxwk = (Datagridviewcheckboxcell) dgdv_skjs. Rows[e.rowindex].                cells["Rxwk"]; Datagridviewcheckboxcell checkcell_bx = (Datagridviewcheckboxcell) dgdv_skjs. Rows[e.rowindex].                cells["BX"]; BOOL Rxwk = Convert.toboolean (checkcell_rxwk.                Value.tostring ()); BOOL bx = Convert.toboolean (checkcell_bx.                Value.tostring ());                         if (E.columnindex = = 3) {if (Rxwk = = False && bx = = True) { Checkcell_rxwk.                        Value = true; Checkcell_bx.                    Value = false; } else if (Rxwk = = False && bx = = False) {Checkcell_ Rxwk.                        Value = true; Checkcell_bx.       Value = false;             } else if (Rxwk = = True && bx = = False) { Checkcell_rxwk.                        Value = false; Checkcell_bx.                    Value = false;                } else {}} else if (E.columnindex = = 4) {if (Rxwk = = True && bx = = False) {Checkcell_rxw                        K.value = false; Checkcell_bx.                    Value = true; } else if (Rxwk = = False && bx = = False) {Checkcell_ Rxwk.                        Value = false; Checkcell_bx.                    Value = true; } else if (Rxwk = = False && bx = = true) {Checkcell_r Xwk.                        Value = false; Checkcell_bx.                    Value = false; } else {}} else {}}} 

as follows: