Reset workbook (All worksheets)
To reset the entire workbook, removing all worksheets and creating a single empty worksheet, use the Reset method of the control.
reoGridControl.Reset();
Reset worksheet
To reset a specified worksheet, use the Reset method of that worksheet.
reoGridControl.CurrentWorksheet.Reset();
Reset worksheet to specified rows and columns
To reset a worksheet to a specified number of rows and columns, use the Reset method and pass the desired row and column counts as arguments.
// number of rows is 1000, and number of columns is 200
sheet.Reset(1000, 200);