Hi Sathish,
To resize the width of the column to fit the size of the text, you need to call the ResizeToFit method . Below is a code snippet.
grid.Model.ColWidths.ResizeToFit(GridRangeInfo.Col(ColIndex));
Here is a sample for implementing it.
http://www.syncfusion.com/Support/user/uploads/GridColWidth_40f0354a.zipLet me know if you are looking something different.
Best Regards,
Haneef