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After customer validation i want to retrieve his user id.. I am using below code for that but it is giving error : Object reference not set to an instance of an object.

if (Membership.ValidateUser(txt_email.Text, txt_password.Text))

                string userId = Membership.GetUser().ProviderUserKey.ToString();

Any possible reasons????

This might work,
string userId = Membership.GetUser("userName").ProviderUserKey.ToString(); // pass your name in GetUser.

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Either GetUser returned null, or ProviderUserKey did. You didn't test either of these to see if they returned null. In the end, you tried to call .ToString() on null. That's why you got the error message you did.
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