Disable cell in specified row.

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DevExpress

I am using Xtragrid. I want to disable one cell when i change value in specified row. I don't know to access a cell in row. I am using RowCellStyle to disable cell. My code:

void taskView_CellValueChanged(object sender, CellValueChangedEventArgs e)
{      
  taskView.RowCellStyle += new RowCellStyleEventHandler(taskView_RowCellStyle);
}

void taskView_RowCellStyle(object sender, RowCellStyleEventArgs e)
{
  e.Column.OptionsColumn.AllowEdit = false;
}

I want to disable cell in taskView_CellValueChanged. How can i access specified cell ???

Thank you !!!