![]() Private void txtTown_Validating(object sender, It's up to you how you do your validation, it could be as simple as text length constraints or as advanced as regular expressions matching. ![]() Now, in the Validating event of the textbox you need to put the code to test the contents for validity and optionally display the error icon. Put an ErrorProvider in your component tray too. Using it on a formĬreate yourself a form, with a textbox on it. While this may sound trivial, it's actually rather useful. When the user hovers their mouse over this icon a tooltip is instantly displayed with information about the invalid field. What this component can do is display a little red icon beside any control which is invalid. It is a component rather than a control, so when you put it on your form it will sit in the component tray below. This little Gem is often left unnoticed, which is a funny thing considering it sits in the Windows Forms Controls Toolbox by default. So what we need is a method of unobtrusively showing that data is invalid, and presenting it in such a way that it is immediately obvious what is wrong and what to do about it. Also, we don't want all the validation done when the user presses the OK button, because they could then potentially be given a great big message with all the fields that are wrong. That would be an unnecessary interruption. The last thing we need is for a Message Box to pop up when we tab away from a field, telling us it's invalid. When we do get it wrong, however, we don't want to be bugged about it. When a user is tabbing fast through a dialog entering data, they are sometimes going to get it wrong. Built-in validation doesn't go much further than an enforcable maximum length for textboxes, but there are some nice methods you can use to make validation a breeze. Data input validation in Windows Forms is essential.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |