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There are 6 validation controls in asp.net.They are

1.RequiredFieldValidator:-Makes an input control a required field
2.CompareValidator:-Compares the value of one input control to the value of another input control or to a fixed value
3.RangeValidator:-Checks that the user enters a value that falls between two values
4.RegularExpressionValidator:-Ensures that the value of an input control matches a specified pattern
5.CustomValidator:-Allows you to write a method to handle the validation of the value entered
6.ValidationSummary:-Displays a report of all validation errors occurred in a Web page

Refer

http://www.c-sharpcorner.com/uploadfile/puranindia/validation-controls-in-Asp-Net/default.aspx

http://www.dotnetcurry.com/ShowArticle.aspx?ID=121

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Satyapriya Nayak13y ago
Accepted answer
There are 6 validation controls in asp.net.They are

1.RequiredFieldValidator:-Makes an input control a required field
2.CompareValidator:-Compares the value of one input control to the value of another input control or to a fixed value
3.RangeValidator:-Checks that the user enters a value that falls between two values
4.RegularExpressionValidator:-Ensures that the value of an input control matches a specified pattern
5.CustomValidator:-Allows you to write a method to handle the validation of the value entered
6.ValidationSummary:-Displays a report of all validation errors occurred in a Web page

Refer

http://www.c-sharpcorner.com/uploadfile/puranindia/validation-controls-in-Asp-Net/default.aspx

http://www.dotnetcurry.com/ShowArticle.aspx?ID=121
Javeed M Shaikh13y ago
Hi,

take a look at this article:

http://www.c-sharpcorner.com/UploadFile/anandn_mvp/aspnetvalidationcontrols06202006021425AM/aspnetvalidationcontrols.aspx