C Validating input for textbox on winforms

Question

I want to check what the user is writing in a textbox before I save it in a database  What is the best way to do this  I guess I can always write some ifs or some try-catch blocks  but I was wondering if there s a better method  I ve read something about Validating Events  but I am not sure how can I use them

User · Answer

With WinForms you can use the ErrorProvider in conjunction with the Validating event to handle the validation of user input. The Validating event provides the hook to perform the validation and ErrorProvider gives a nice consistent approach to providing the user with feedback on any error conditions.

http://msdn.microsoft.com/en-us/library/system.windows.forms.errorprovider.aspx

User · Answer

Description  There are many ways to validate your TextBox  You can do this on every keystroke  at a later time  or on the Validating event   The Validating event gets fired if your TextBox looses focus  When the user clicks on a other Control  for example  If your set e Cancel   true the TextBox doesn t lose the focus      MSDN - Control Validating Event When you change the focus by using the keyboard  TAB  SHIFT TAB  and so on   by calling the Select or SelectNextControl methods  or by setting the ContainerControl ActiveControl property to the current form  focus events occur in the following order      Enter      GotFocus      Leave      Validating      Validated      LostFocus      When you change the focus by using the mouse or by calling the Focus method  focus events occur in the following order       Enter      GotFocus      LostFocus      Leave      Validating      Validated   Sample Validating Event  private void textBox1 Validating object sender  CancelEventArgs e        if  textBox1 Text     something           e Cancel   true      Update  You can use the ErrorProvider to visualize that your TextBox is not valid  Check out Using Error Provider Control in Windows Forms and C   More Information   MSDN - Control Validating Event MSDN - ErrorProvider Component  Windows Forms  Using Error Provider Control in Windows Forms and C

[c#] C# Validating input for textbox on winforms

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