When i click the radio button in datagrdiview all checkbox value to be checked true

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C#

when i click the radio button in datagridview all check box value to be checked true.

My code as follows in radio button checked_changed_Event;

private void SessAM_CheckedChanged(object sender, EventArgs e)
      {
            if (SessAM.Checked = true)
          {
              for (int i = 0; i < DGv_Session.RowCount; i++)
              {

                  DGv_Session.Rows[i].Cells[1].Value = true;
                  DGv_Session.Rows[i].Cells[2].Value = true;
                  i++;
              }
          }

      }

Ouptut as follows in datagridview;

RadioButton

Days 1 2

1 chbox chbox
2 chbox chbox
3 chbox chbox
4 chbox chbox
5 chbox chbox

When i click the radio button, in datagridview Days 1,3 and 5 chbox value only checked.

Reamining 2 and 4 checkbox value is unchecked why?

when i click the radio button i want all the Days 1 to 5 all checkbox to be checked.