DataGridView Checkbox value

I have a winForm application that contains a DataGridView.  The grid contains several columns, one of which is a checkbox column.  I'm able to target the column but the boolean value is always true no matter the actual state on screen.  Why does the checkbox show "true" when it's clearly unchecked?  This same type of code works fine for the other text cells.

private void UpdateAdminMemberRecord(DataGridViewCellEventArgs e)
        {
            //Instantiate objects  
            String strNewValue = "";
            String strColumnName = "";
            Int32 intTeamMemberID = 0;
            Boolean blnIsActive = false;
            OleDbCommand cmdUpdateMembers = new OleDbCommand();
            Tools objTools = new Tools();

            switch (grdAdminMembers.Columns[e.ColumnIndex].HeaderText)
            {
                case "FirstName":
                    strNewValue = (String)grdAdminMembers.Rows[e.RowIndex].Cells[e.ColumnIndex].Value;
                    break;
                case "LastName":
                    strNewValue = (String)grdAdminMembers.Rows[e.RowIndex].Cells[e.ColumnIndex].Value;
                    break;
                case "Username":
                    strNewValue = (String)grdAdminMembers.Rows[e.RowIndex].Cells[e.ColumnIndex].Value;
                    break;
                case "Password":
                    strNewValue = (String)grdAdminMembers.Rows[e.RowIndex].Cells[e.ColumnIndex].Value;
                    break;
                case "IsActive":
                    blnIsActive = (Boolean)grdAdminMembers.Rows[e.RowIndex].Cells["IsActive"].Value;
                    if (blnIsActive == true) { strNewValue = "1"; }
                    else { strNewValue = "0"; }
                    break;
            }

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