Validation textbox c# windows application

For the validity of a password, we need to recall the concept when we are creating a password for signup in a website. We can use the C Regex class and regular expressions to validate an email in C.

The following Regex is an example to validate an email address in C. To verify that the email address is valid, the IsValidEmail method calls the Regex. The third parameter is a MatchEvaluator delegate that represents the method that processes and replaces the matched text. The regular expression pattern is interpreted as follows. When asking a user to enter a mobile number, we usually validate if a number has 10 digits or not.

If not, we ask the user to enter the full mobile number. In this case, the following code should be written as the regular expression on the textbox which validates the number. What is form validation? Step 2: Select the Text box and go to its properties. Now we have the text box validation method. Focus ; errorProviderApp. SetError textBoxName, "Name is required! You've tagged the question winforms, but it sounds as though you're asking about webforms.

Which is it? Add a comment. Active Oldest Votes. Improve this answer. Arseny Arseny 7, 4 4 gold badges 35 35 silver badges 52 52 bronze badges. IsNullOrEmpty txtname. Focus ; errorProvider1. IsNullOrEmpty txtroll. These three things work together like a charm. Sign up or log in Sign up using Google. Sign up using Facebook.

Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. BTNOK[ to check if textbox 7 character and then run save if it is. TextBox has a MaxLength property.

Set it to 7 if you do not want users to type more than 7 chars. We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, learning, and sharing knowledge. You're trying to visit a URL that doesn't currently exist on the web. Most likely, a member posted a link a long time ago to a web page that has since been removed. It's also possible that there was a typo when posting the URL.

We redirect you to this notice instead of stripping out the link to preserve the integrity of the post. HiHi seems like i have so many queries for programming.. Answered by sknake 1, in a post from 12 Years Ago. Just test the length. Generic; using System. ComponentModel; using System.