Urgently SendKeys isn't working

Everyone Please help me, I develope DLL to plug in with other application before I use VB6 develope and using SendsKey ("{Enter}") is working but now I use VB.Net, Develope DLL and using SendKeys.Send ("{Enter}") but It's not working now , I don't know how to sendkeys in DLL Please Help me

You should be able to find something here:
SendKeysMSDNSearch


Looks like you need this:
Microsoft.VisualBasic.Compatibility.VB6
Support

TT(n) , Thanks you for your recommendation ,it's very useful for me , If you would like for Sendkeys Sample code in Compatible VB6 Please