How do you evaluate a html checkbox using C#?

Question

I'm trying to send one of two different pieces of data to a database, depending on whether the user has checked an html checkbox. I can't figure out how to evaluate the checkbox using C#, without MVC. Here's what I've been trying in a simplified form:

@{
    var Category = "";
    var AltCategory = "";

    var db = Database.Open("Inventory");

    var Checkbox_value =(Request["altCategory_checkbox"]=="on") ? true : false;

    if(IsPost && Validation.IsValid()){
        Category = Request.Form["ListCategory"];
        AltCategory = Request.Form["AltCategory"];

        if(Checkbox_value = true){
            Funcs.AddNewProduct(Category);
        }
        else{
            Funcs.AddNewProduct(AltCategory);
        }
        Response.Redirect("~/Members/Products");}
}

And the html:

  <form method="post">
   <fieldset>
      <p><label for="Category">Category:</label>
         <input type="text" name="Category" value="@Request.Form["Category"]" />
      </p>

    <input type="checkbox" name="altCategory_checkbox" id="altCategory_checkbox">
    <label for="altCategory_checkbox">Add new category?</label> 

      <p><label for="AltCategory">New category:</label>
         <input type="text" name="New category" value="@Request.Form["AltCategory"]" />
      </p>

         <p><input type="submit" name="buttonSubmit" value="Add product" /></p> 

    </fieldset>
  </form> 

Any help is greatly appreciated, and I apologize if this is a trivial question.

Answer 1

The following ended up being a solution:

 @{
    var Category = "";
    var AltCategory = ""; 

    var db = Database.Open("Inventory");

    if(IsPost){
        Category = Request.Form["ListCategory"];
        AltCategory = Request.Form["AltCategory"];
        bool CategoryCheckbox = Request["CategoryCheckbox"].AsBool(); 

        if(CategoryCheckbox){
            Funcs.AddNewProduct(Category);
        }
        else{
            Funcs.AddNewProduct(AltCategory);
        }
        Response.Redirect("~/Members/Products");}
} 

With html:

  <form method="post">
   <fieldset>
      <p><label for="Category">Category:</label>
         <input type="text" name="Category" value="@Request.Form["Category"]" />
      </p>

    @Html.CheckBox("CategoryCheckbox", new { value = "true" })
    <label for="CategoryCheckbox">Add new category?</label>

      <p><label for="AltCategory">New category:</label>
         <input type="text" name="New category" value="@Request.Form["AltCategory"]" />
      </p>

         <p><input type="submit" name="buttonSubmit" value="Add product" /></p> 

    </fieldset>
  </form> 

The trick is to read the checkbox as a bool using bool CategoryCheckbox = Request["CategoryCheckbox"].AsBool();