Validating numeric textbox in vb net

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If you determine that validation has failed, set the Cancel property of the Cancel Event Args is to true and clear the control; focus will remain there. I've done some research on this and still cannot get my program to work. Key Press Dim User Entry As Boolean If User Entry = Is Numeric(False) Then Message Box. ") End If End Sub Private Sub Num1_Key Up(sender As System. It needs to be a nested If statement for this to happen.if u want to use javascript write a function on onkey Down event of a textbox function checkvalid() logic here is that on keydown u ll first check whether textbox already has anything if no direct allow if yes check the length if its 1 then check the value in textbox if its 1 or 2 allow to enter but if its 3 then check the to be typed integer if its 0 then allow else dont allow return false will not allow anything to be typed Hi, 1. Within function , take the value of that textbox using Element By Id and ckeck that value after keypress is less than equal to 30 or not? I am trying to validate wether a number is a decimal in Visual Basic. Therefore you can use the solutions that others have mentioned and use any of the following in a sensible way. The results I get when the number is valid the msg Box shows. Private Sub txt Value_Key Press(By Val sender As Object, By Val e As System.

If this value is greater than 0 then it says it's not valid. Index Of(".") This should restrict user input to decimal values, allowing negative values as well. I am trying to set up a form to accept a telephone number, but i am unsure of how to validate it so it will only take numeric values with 11 digits. Show("You must enter a Telephone Number.", "Data Entry Error", Message Box Buttons. Information) 'makes sure that only numbers and the backspace are allowed in the fields. It can contain only unformatted text in its Text property. In many situations you need to enter only numeric values in the Textbox.

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