c++/cli disable checkbox cell in dataGridView after change another checkbox cell value changed

i have a dataGridView with 2 columns of checkbox i want if the first checkbox value changed to be false i want to disable the next cell in the same row i write the following code but it done after another click

this->dataGridView1->CellValidated += gcnew         
System::Windows::Forms::DataGridViewCellEventHandler(this, 
&categoryOptionDialog::dataGridView1_CellValidated );

and function is

private: System::Void dataGridView1_CellValidated(System::Object^  sender, 
System::Windows::Forms::DataGridViewCellEventArgs^  e)
    {

        try{
            int j = dataGridView1->CurrentCell->RowIndex;
            if (dataGridView1->Rows[j]->Cells[1]->Value->ToString() != 
              "True")
            {
                DataGridViewCell^ cell = dataGridView1->Rows[j]->Cells[2];
                DataGridViewCheckBoxCell^ chkCell = 
                (DataGridViewCheckBoxCell^)cell;
                chkCell->Value = false;
                chkCell->FlatStyle = FlatStyle::Flat;
                chkCell->Style->ForeColor = System::Drawing::Color::DarkGray;
                cell->ReadOnly = true;
            }
            else
            {
                DataGridViewCell^ cell = dataGridView1->Rows[j]->Cells[2];
                DataGridViewCheckBoxCell^ chkCell = 
                (DataGridViewCheckBoxCell^)cell;

                chkCell->FlatStyle = FlatStyle::Standard;
                chkCell->Style->ForeColor = System::Drawing::Color::White;
                cell->ReadOnly = false;
            }

             dataGridView1->Update();
        }
        catch (...){}
        }