validation check Isue in MVC Same Model for two form

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C#

.NET

MVC3

i have a model for Login form. In which i have applied Required field validation for "Password" and "Confirm Password" for ssign in. I am using the same Model at the time for user Login. It will not login the user as "Confirm Password" is required. What to do for validation check. that one model will implement validation for both form.