Hi, I wanted to create a code wherein If I put an invalid Identification code an error message will display. As of the moment what I had created was if the user did not put any string(null) in the textbox(field) it will display a message and when the user will insert the correct Identification code …

Display Error message

ahmdjsalhi October 4, 2018, 10:21am 2

I think this example would help you.

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