Model Validation using StringLength validation attribute - asp.net-core

Question

In my ASP.NET MVC Core 1.1.1 I've a form with one input as follows where user is required to enter the district code as two characters such as 01, 02,...10,11, etc. But when I submit the form by entering district code as, say, 123, it still successfully submits the form without forcing user to enter the district code as two characters. What I may be missing?
MyViewModels
...
[Display(Name = "District"),StringLength(2)]
public string Dist { get; set; }
...
Form
#model MyProj.Models.MyViewModel
...
<div class="form-group">
<label asp-for="Dist" class="col-md-2 control-label"></label>
<div class="col-md-2">
<input asp-for="Dist" class="form-control" />
<span asp-validation-for="Dist" class="text-danger"></span>
</div>
<div class="col-sm-pull-8">01 to 53 — district codes</div>
</div>
...
NOTE
I am using default ASP.NET Core Web Application template with latest version of VS2017 that by default installs necessary Bootstrap and other javascripts when one uses such template.

Answer 1

1 - The first parameter of StringLength is Maximum length. To define minimum you can do:
[Display(Name = "District")]
[Required]
[StringLength(2, MinimumLength = 2)]
public string Dist { get; set; }
or:
[Display(Name = "District")]
[Required]
[MinLength(2)]
[MaxLength(3)]
public string Dist { get; set; }
The Required attribute is missing!
View
Validation script:
#section Scripts { #Html.Partial("_ValidationScriptsPartial") }
Controller
[HttpPost]
public IActionResult Contact(MyViewModel model)
{
if (ModelState.IsValid)
{ ... }