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How can I round numbers up to the nearest whole or to the nearest half?

For Example:

اتمنى أن يفى هذا بالغرض

[attachment=28215]

Take it's :

(18-09-22, 01:35 AM)رمضان272 كتب : [ -> ]اتمنى أن يفى هذا بالغرض

Thank you very much

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(18-09-22, 01:41 AM)Taha Okla كتب : [ -> ]Take it's :

كود :

   Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
       Me.Text = Approximation(TextBox1.Text)
   End Sub

   Function Approximation(Number As Double) As String
       Dim N1() As String = Format(Double.Parse(Number), "0.00").Split(".")
       If Val(N1(1)) > 50 Then
           N1(1) = "00"
           N1(0) = N1(0) + 1
       ElseIf Val(N1(1)) > 0 Then
           N1(1) = 50
       End If

       Return N1(0) & "." & N1(1)
   End Function

Thank you very much