Asp.net is null or empty

Find centralized, trusted content and collaborate around the technologies you use most. Connect and share knowledge within a single location that is structured and easy to search. Possible Duplicate: textbox empty check using javascript.

I have a asp. NET 4. Using Validators will help you handle some of this validation out of the box. One of them is RequiredValidator , which evaluates the value of an input control to ensure that the user enters a value. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Indicates whether the specified string is null or an empty string "". The following example examines three strings and determines whether each string has a value, is an empty string, or is null. IsNullOrEmpty is a convenience method that enables you to simultaneously test whether a String is null or its value is String.

It is equivalent to the following code:. Empty , or it consists only of white-space characters. NET question on a topic that's not covered by one of the other more specific forums - ask it here. Sign in to vote. QueryString["itemid"]; and if id is not sent, i want it to be 0. Tuesday, April 10, PM. User posted Hello, Try this if Request. IsNullOrEmpty Request. Wednesday, April 11, AM. In your particular case, it doesn't matter how large inheritance hierarchy is, what matters is if it applicable or not.

Is it important for the methods accepting apple and okra and orange to differentiate whether these three are fruits or vegetables? If yes, create the parent class or interface and help the methods. Otherwise, you probably just need a better name - something like Eatables which have the method Eat. Further, whether the sacrifice is small or big should be decided by looking at every aspect that this small change affects. You may have a confused developer who will look through entire code to understand why did the original code writer made this distinction and he will find that it wasn't needed.

Then he was 2 more people about it and take their time even though his guess that this distinction wasn't needed is already correct. Further this code will require maintenance and will need you to update your tests when this wasn't needed at all in the first place.

Show 3 more comments. Frederik Gheysels Frederik Gheysels There is also maintenance overhead of implementing things too early. Elton Elton 83 7 7 bronze badges.

Ondrej Tucny Ondrej Tucny Anything that moves can be considered food in Asia :P, no offense — Viet Nguyen. The Overflow Blog. Podcast Making Agile work for data science.