Handle PrepareViewStyleInfo and getting the value to be tested from the passed-in style. In your handler, you would conditionally set e.Style.Color by testing the cell value (or cell text) based on whether the e.ColIndex and e.RowIndex pointed to your test cell.
private void gridDataBoundGrid1_PrepareViewStyleInfo(object sender, Syncfusion.Windows.Forms.Grid.GridPrepareViewStyleInfoEventArgs e)
{
//test cell 1,4
if(e.ColIndex == 4 && e.RowIndex == 1)
{
try
{
//this assumes cell is an int
int cellValue = int.Parse(e.Style.Text);
if(cellValue > 10)
e.Style.BackColor = Color.Red;
}
catch{}//empty
}
}