Html.EnumDropdownListFor: Showing a default text

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Try to change the Index of LicenseTypes start from 1 not 0 like below:

public enum LicenseTypes
{
    Trial = 1,
    Paid = 2
}

Then you can use Range attribute to validate the selected license type like below:

public class YourViewModel
{
     //Other properties
     [Range(1,int.MaxValue,ErrorMessage = "Select a correct license")]
     public LicenseTypes LicenseTypes { get; set; }
}

Finally, in your view:

   @Html.EnumDropDownListFor(m => m.LicenseTypes,"Select a license",new { @class = "form-control"})
   @Html.ValidationMessageFor(m => m.LicenseTypes)

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