Doing so can cause your application or the operating system to stop responding.
That may seem like Captain Obvious speaking, but you'll be amazed at some of the data that gets entered into a name field. I then created an If statement to determine how the input data was formatted and whether or not the data is only alphabetic. Figure 1 - These objects will determine if all our data is valid or not. Clear() 'Clear Text Box Name Valid = False 'Boolean = False Else Name Valid = True 'Everything Fine End If End Sub Easy one to start with. Focus() 'Set Focus To Text Box End If End Sub Private Sub txt Email_Lost Focus(sender As Object, e As System. Lost Focus Validate Email() 'Check Email Validity End Sub The expression may look horrible to the layman's eye, but look closer. To check if the user has entered an email that actually exists, you will have to find a different way such as to send a of some sorts.Based on each of these variables' values, we will know if the data is correct or not. The Leave event fires when the control loses focus. As you can see, Regular Expressions are a vital tool to have at your disposal, so become good friends with them.The Private void txt Cr_Lost Focus()event occurs when the input focus leaves the debit text box control.I am trying to validate user input into a textbox to make sure that the user has entered a number that is in a decimal format. 15.1; 5.1 etc.) I think that I am close on the code below in terms of validating that the textbox input is a number but I am not sure how to validate the decimal.
Private Sub Text Box1_Key Press(By Val sender As Object, By Val e As System.