Case in Sensitive Problem

Hi,

MResult = MResult.Replace(txtSearch.Text,

Here from Mresult content i want to search my textbox content ..for that i applied style for display the text in different color..

But if i give lowercase like hurry mean it show different color for hurry oly
same Hurry i gave in textbox it it shows Hurry oly in different color..i want both to be selected however i gave .if Hurry up igave mean that also want to selected ..how to do


"" + txtSearch.Text + "");