Hi Baotq,
Thank you for your interest in Syncfusion products.
You can display the selected value of dropdown GridListControl in another cell of GridControl by accessing GridDropDownGridListControlCellRenderer class.
The following code snippet illustrates this.
[C#]
private void gridControl1_CurrentCellShowingDropDown(object sender, Syncfusion.Windows.Forms.Grid.GridCurrentCellShowingDropDownEventArgs e)
{
GridDropDownGridListControlCellRenderer listRenderer = (GridDropDownGridListControlCellRenderer)this.gridControl1.GetCellRenderer(3, 3);
this.gridControl1[1, 1].CellValue = listRenderer.ListControlPart.SelectedValue;
}
Here is a sample for your reference.
http://websamples.syncfusion.com/samples/Grid.Windows/F69293/main.htmPlease let me know if you have any other queries.
Regards,
Jaya