Sending mail from website in ASP.NET

I coded a website contact form with mail send and after dozens of research cannot find an answer hoping stackoverflow users can help.

The aspx.cs file signs into the specified gmail configuration to send the email HOWEVER is there a way to set the SENDER as what the user inputs in the email textbox, so instead of recieving the email from myself so when clicking "Reply" on the mailbox its not replying to myself? If that makes sense?

So the sender is not me but the sender is what the user inputs in the mail box and I receive the email FROM the input value rather than myself