Problems comparing Value = {}

The following should be execute?
 int rowcount = this.dataGridView1.BindingContext[this.dataGridView1.DataSource].Count-1;
           
            // Get specific row selected.
            dr = ds.Tables[0].Rows[this.currRow.Index];
           
            // Mode 1
            // No Effective Date therefore draft
            // Select Not Approved row with effective date null and the last row in the grid
            if ((dataGridView1.SelectedRows[0].Cells[7].Value == null) && (rowcount >= this.dataGridView1.CurrentRow.Index))
               ModeType = modeEnum.mode1;

It seems that this does not work (dataGridView1.SelectedRows[0].Cells[7].Value == null)
maybe another variable empty?

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