Using DataAnnotations to compare two model properties

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Make sure that your project references system.web.mvc v3.xxxxx.

Then your code should be something like this:

using System.Web.Mvc;

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.
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[Required(ErrorMessage = "This field is required.")]    
public string NewPassword { get; set; }

[Required(ErrorMessage = "This field is required.")]
[Compare(nameof(NewPassword), ErrorMessage = "Passwords don't match.")]
public string RepeatPassword { get; set; }

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