Double-clicking the button does nothing, even with code inside. Fix: Look at the top of the code file (Designer.vb). Ensure you see: Handles Button1.Click If missing, type it manually.
Dim num As Integer = Val(txtInput.Text) Dim isPrime As Boolean = True If num <= 1 Then isPrime = False For i As Integer = 2 To Math.Sqrt(num) If num Mod i = 0 Then isPrime = False Exit For End If Next If isPrime Then MessageBox.Show("Prime Number") Else MessageBox.Show("Not a Prime Number") End If Use code with caution. Copied to clipboard vb net lab programs for bca students fix