Public Class Form2_Load
LabelX1.Text = "Welcome" + (Form1.TextBoxX1.Text) + "to the Injector"
End Class
End Class

LabelX1.Text = "Welcome" + (Form1.TextBoxX1.Text) + "to the Injector"
Dim I as Integer = Textbox1.Text '(tell VB you will be using a integer in the contents of textbox1) Label1.Text = 1 + Textbox1.text + 4
LabelX1.Text = "Welcome" & Form1.TextBoxX1.Text & "to the Injector" (no need for the () Parenthesis)
Get it?