Add Control to validate in ModelState manually - asp.net-mvc

Question

I have one scenario as mentioned below :
In my xyz.cshtml page, i have two form. and in xyz.cshtml.cs page i have one InputModel that contains Property for both form.
public class InputModel
{
[Required(ErrorMessage = "The Email field is required.")]
[EmailAddress(ErrorMessage = "Enter a valid email address.")]
[RegularExpression(
#"^[A-Za-z0-9](([_\.\-]?[a-zA-Z0-9]+)*)#([A-Za-z0-9]+)(([\.\-]?[a-zA-Z0-9]+)*)\.([A-Za-z]{2,})$",
ErrorMessage = "Enter a valid email address.")]
public string Email { get; set; }
[Required(ErrorMessage = "The Password field is required.")]
[DataType(DataType.Password)]
public string Password_ChangeEmail { get; set; }
[Required(ErrorMessage = "The OldPassword field is required.")]
[DataType(DataType.Password)]
public string OldPassword { get; set; }
[Required(ErrorMessage = "The New Password field is required.")]
[DataType(DataType.Password)]
[CustomPassword(8, 15, ErrorMessage = "The password is invalid.")]
public string Password { get; set; }
[Required(ErrorMessage = "The Confirm Password field is required.")]
[DataType(DataType.Password)]
[Compare("Password", ErrorMessage = "The passwords do not match.")]
public string ConfirmPassword { get; set; }
}
I am using first 2 property in one form and rest of the property in 2nd form.
Now, issue is when i am pressing Submit button from 1st form, it's validating 2nd form as well. So for the time i have used ModelState.Clear() . But if i am using this and i am not wrong it will stop validating all the property.
So, if you guys have any solution like, is it possible to control in ModelState manually for validate.
If i need to share anything else, please suggest.
Thanks

Answer 1

1) You could split the model into two, one model for each form and use them in the post actions for these forms.
public class LoginModel
{
[Required(ErrorMessage = "The Email field is required.")]
[EmailAddress(ErrorMessage = "Enter a valid email address.")]
[RegularExpression(
#"^[A-Za-z0-9](([_\.\-]?[a-zA-Z0-9]+)*)#([A-Za-z0-9]+)(([\.\-]?[a-zA-Z0-9]+)*)\.([A-Za-z]{2,})$",
ErrorMessage = "Enter a valid email address.")]
public string Email { get; set; }
[Required(ErrorMessage = "The Password field is required.")]
[DataType(DataType.Password)]
public string Password_ChangeEmail { get; set; }
}
public class ChangePasswordModel
{
[Required(ErrorMessage = "The OldPassword field is required.")]
[DataType(DataType.Password)]
public string OldPassword { get; set; }
[Required(ErrorMessage = "The New Password field is required.")]
[DataType(DataType.Password)]
[CustomPassword(8, 15, ErrorMessage = "The password is invalid.")]
public string Password { get; set; }
[Required(ErrorMessage = "The Confirm Password field is required.")]
[DataType(DataType.Password)]
[Compare("Password", ErrorMessage = "The passwords do not match.")]
public string ConfirmPassword { get; set; }
}
2) Create a combined model
public class InputModel
{
public LoginModel LoginModel { get; set; }
public ChangePasswordModel ChangePasswordModel { get; set; }
}
3) add two post actions
public IActionResult LoginPost(InputModel model)
{
...
return View("InputPage", model);
}
public IActionResult ChangePasswordPost(InputModel model)
{
...
return View("InputPage", model);
}
4) use the combined model in your cshtml page
#model InputModel
...
#using (Html.BeginForm("LoginPost", "Home")) {
#Html.TextBoxFor(m => m.LoginModel.Email)
<input type="submit" value="submit" />
}