How to highlight row in datagrid

Try This .Idea is to override paint..This is working even i worked on it.copy and change according to your requirement...

public class DataGridColoredTextBoxColumn : DataGridTextBoxColumn

protected override void Paint(System.Drawing.Graphics g, System.Drawing.Rectangle bounds, System.Windows.Forms.CurrencyManager source, int rowNum, System.Drawing.Brush backBrush, System.Drawing.Brush foreBrush, bool alignToRight)

// the idea is to conditionally set the foreBrush and/or backbrush

// depending upon some criteria on the cell value

try

dtPaint = ((DataView)this.DataGridTableStyle.DataGrid.DataSource).Table;

//If Amount Mismatch then highlight

if (drPaint["Amount"].ToString() != drPaint["Last Amount"].ToString())

backBrush = new LinearGradientBrush(bounds,

foreBrush = new SolidBrush(Color.White);

catch(Exception ex)

finally

// make sure the base class gets called to do the drawing with

// the possibly changed brushes

base.Paint(g, bounds, source, rowNum, backBrush, foreBrush, alignToRight);

Just go thru following link. I hope this will help you..

http://www.syncfusion.com/FAQ/WindowsForms/FAQ_c44c.aspx#q745q                                                
Regards,
Nilesh.