Pre defined value
 

I have input box that when certain criteria are met needs
a predefined value in a text box within the input box. I
have used the following code to try this but it doesn't
seem to work

Activity_Text.Text = "812402"
Job_No_Text.Text = ""
Rec_Point_Text.Text = ""

Activity_Text, Job_No_Text and Rec_Point_Text are the
named text boxes. When the input box opens the Activity
text box is empty!!!

Many thanks in advance