How to give client side validation MVC

Question

I have given validation on server side but I need validation on typing itself. It must show the error message when typing is wrong.

controller

 

if (!string.IsNullOrEmpty(student.FirstName))

{

string nameRegex = @"^([a-zA-Z ])+$";

Regex re = new Regex(nameRegex);

if (!re.IsMatch(student.FirstName))

{

ModelState.AddModelError("FirstName", "FirstName only be letters");

}

}

else

{

ModelState.AddModelError("FirstName", "FirstName is required");

}

 

I have given validation in regular expression Like this in controller part

I need to give validation for name that it should accept only letters and numbers and no special characters

model

 

public string FirstName { get; set; } 

 

how can I do this ?? can anyone please help me to do this ?