Validating date in textbox in asp net
The client side validation has a number of features: In order to use validators effectively, it helps to have a firm definition of what they are.
Let's refine our previous definition a little: "A validator is a control that checks one input control for a specific type of error condition and displays a description of that problem." This is an important definition, because it means that you frequently need to use more than one validator control for each input control.
Validation controls change all that, because almost all the duplicated logic is encapsulated in the controls.
If a client with Internet Explorer 4.0 or later uses your page, it can do the same input validation that takes place on the server without you having to write any special client script.
Starting page: The first thing we need to enforce is that the fields get filled in at all.This is a taxing process for end users, developers, and servers alike.DTHML and scripting languages improve things somewhat.We wanted to dramatically reduce the amount of validation code needed for future applications.The validator controls are the main elements of the solution. NET control that checks a specific validity condition of another control.
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Here is how we add a Required Field Validator to the User ID field: The * is displayed next to the label if the input is blank. The "Control To Validate" property specifies the ID of the control to validate.