Hi I am checking to see if a textbox contains a number, or is null. If it is non numeric or null a message box appears asking the user to input the proper value. When the user clicks OK on the msgbox the program will continue to execute the code. I want it to stop executing the code and revert back to its default state as it would be if you just opened the program. What is the command for doing this so I can add to the if statement?? Thanks for your help!

Dim numCheckV as boolean
numCheckV = IsNumeric(Vinput)

If numCheckV = False OrElse TextBox1.Text = "" Then
MsgBox("Please enter voltage!")
End If