Asp.Net Mvc Checkboxfor default?

model

[DefaultValue(true)]
public bool IsActive { get; set; }

      

        
        
        
      

    

View

@Html.CheckBoxFor(model => model.IsActive)

      

        
        
        
      

    

html output and this is my expected

<input data-val="true" data-val-required="Yayında alanı boş bırakılmamalıdır!" id="IsActive" name="IsActive" type="checkbox" value="true" class="valid">

      

        
        
        
      

    

but the checkbox is not checked. I can't figure out why? What am I missing?

Thank.