How to Validate Double Value in VB.Net

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This tutorial is all about How to Validate Double Value in VB.Net. With this tutorial you can Validate Double Value in VB.Net easily. So let’s get started:

  • First is open the Visual Basic, Select File on the menu, then click New and create a new project.

  • Then a New Project Dialog will appear. You can rename your project, depending on what you like to name it. After that click OK

  • Design your form like this just like what I’ve shown you below.
    Add a Label, Button and Textbox.

  • Add this following function.
    1. Function validateDoublesAndCurrency(ByVal stringValue As String) As Boolean
    2. Dim rslt As Boolean = False
    3. Dim value As Double
    4. Dim valueToTest As String = stringValue
    5. TryvalueToTest = Double.Parse(stringValue, Globalization.NumberStyles.Currency)
    6. Catch ex As ExceptionEnd Try
    7.  
    8. If Double.TryParse(valueToTest, value) Then
    9.  
    10. rslt = True
    11. Else
    12.  
    13. rslt = False
    14. End If
    15. Return rslt
    16. End Function
  • Then add this code to the button.
    1. Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    2. If validateDoublesAndCurrency(TextBox1.Text) = False Then
    3. MsgBox("Price entered is not valid")
    4. Else
    5. MsgBox("Price is Valid")
    6. End If
    7. End Sub
  • Finally, Click F5 to run.

Output:

 

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