Patching.. Help

I have an exe and i want to make an other exe which will patch the first exe. i want to be able to patch the values of 3 textboxes of the first exe.. The problem is that i cannot find the offset address of the textboxes of the first exe so i can do the patch.. I can find the string's address of an exe which was build in vb6, using w32dasm BUT now im using vb.net 2010 and i cannot find the strings.. "/

thanks

PS i do have the source code but i dont want to recompile all the time..i want to be able to change the values using an other exe..

Your VB6 app would need a common library that you could replace. Otherwise, re-write, deploy with CLICK-ONCE, and update it whenever you like!