i kept getting the below error message that would freeze the program:

System.Data.ConstraintException was unhandled by user code

Message=This property cannot be set to a null value.

Source=System.Data.Entity

StackTrace:

at System.Data.Objects.DataClasses.StructuralObject.SetValidValue(String value, Boolean isNullable)

at Movies.Models.Movie.set_Title(String value) in C:\Users\Ned\documents\visual studio 2010\Projects\Movies\Movies\Models\Movies.Designer.cs:line 177

InnerException:

After i had the javascripts, I found that not only the Title and Price fields were validate but the Release Date field was

validated as well. I don't know why the Genre field was not validated. shouldn't they all be validated

by the mvcvalidation javascript?

It's very cool that adding the attributes of [Required..] and [Range...] do so much for us automatically. Great demo of the value of having a Framework!

System.Data.ConstraintException was unhandled by user code

Message=This property cannot be set to a null value.

Source=System.Data.Entity

StackTrace:

at System.Data.Objects.DataClasses.StructuralObject.SetValidValue(String value, Boolean isNullable)

at MoviesII.Models.Movie.set_Title(String value) in ...\Models\Movies.Designer.cs:line 179

InnerException:

But when I closed the popup and reran the project the Html page was correct with the "blank" title and the red "Titles are required"

Great Lessons by the way - and free to - Thanks for everything!

Genre is not validated because we did not have code for Genre validation. If you want to validate Genre also, then you need to add this code inside the Movie class

[Required(ErrorMessage = "Enter the Genre.")]

public string Name { get; set; }

VB.Net Version

<MetadataType(GetType(Movie.MovieMetaData))>

Partial Public Class Movie

Class MovieMetaData

<Required(ErrorMessage:="Titles are required")>

Public Property Title As String

End Class

End Class

System.Data.ConstraintException was unhandled by user code

Message=This property cannot be set to a null value.

Source=System.Data.Entity

StackTrace:

at System.Data.EntityUtil.ThrowPropertyIsNotNullable()

at System.Data.Objects.DataClasses.StructuralObject.SetValidValue(String value, Boolean isNullable)

at Movies.Models.Movie.set_Movie_Name(String value) in

line 179

InnerException:

[Required(ErrorMessage = "A Title is required")]

[DisplayFormat(ConvertEmptyStringToNull = false)]

public string Title { get; set; }

For some reason empty strings are being converted into null. Since the Title column in the Movie table in the database in NOT nullable, the Movie class that was generated (found in Movies.Designer.cs) has had the following attribute assigned to the Title property:

[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]

But we can prevent the empty string from being converted using the DisplayFormat attribute:

[DisplayFormat(ConvertEmptyStringToNull = false)]

[DisplayFormat(ConvertEmptyStringToNull = false)]

public string Genre { get; set; }

<h2>Create</h2>

<script src="../../Scripts/MicrosoftAjax.js" type="text/javascript"></script>

<script src="../../Scripts/MicrosoftMvcValidation.js" type="text/javascript"></script>

<% Html.EnableClientValidation() ; %>

<% using (Html.BeginForm()) {%>

<%: Html.ValidationSummary(true) %>

<fieldset>

<legend>Fields</legend>

<script src="../../Scripts/MicrosoftAjax.js" type="text/javascript"></script>

<script src="../../Scripts/MicrosoftMvcValidation.js" type="text/javascript"></script>

not

<script src="/Scripts/MicrosoftAjax.js" type="text/javascript"></script>

<script src="/Scripts/MicrosoftMvcValidation.js" type="text/javascript"></script>