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Expand the Installed node then the Templates node then the Visual C# node then then the Web node then select Visual Studio then choose ASP. Expand Installed then Visual C# then select Data then choose ADO.
Add another class “Student Meta Data” in the same cs file and add the following properties. The Meta Data Type attribute is present in Systrem. Run the application and do the same step again using Fiddler.
Ensure the property name in the Student Custom Data class must match the property name of the properties present in the auto-generated Student class.
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In this article we use the In the code above I have taken the ASP.
The condition will be as follows: is shown to the user and finally we are returning false; that is very important.
Importantance of returning false It's very important to use the return false statement after the condition block that return false so if validation determines that the business requirements are not met then the form cannot be submitted.
We don't want our entities to be called tbl Course and tbl Student. Step 4 The next step is to add a controller and for that right-click on the Controllers folder then select Add then select Controller. Select the template “MVC Controller with read/write actions and views using Entity Framework”Select Student as the model class. Like Home Controller, Index, Details, Create, Edit and Delete.cshtml files. So, if we click on the create link, we will get this layout and this layout is nothing but a Create scaffold template. Let's see what happens if we don't insert any data into the fields and click the create button. So, to prevent the fields from having blank records we can make all the properties required. So, let's see how to change this validation message. In the Edit view, we don't want the Student Name to be editable. We got a validation error in the Name field because this Student Name field is a read-only field but we are not posting the value back to the server and when we click the Save button this field becomes null. Look at how the Edit post action method is implemented. To delete a record click the Delete link in the Index page. So, in this article we saw how to Insert, Update and Delete records and with that we have also seen how to prevent un-intended updates.
So, let's replace tbl Course with Course, tbl Student with Student, tbl Students with Students and tbl Course with Course. For now just run the application and by default the Index action method will be invoked that will display the Index.shtml file. If we insert a new record: Click Create, you will be redirected to Index.cshtml and you will see Michael's record. Since this is auto-generated code, it will not be a good idea to make any changes here. If you look at the image below, you will see the class Student is a partial class. In the constructor of the Required Attribute class add a custom error message. Step 6To specify a gender, users need to input their gender. So, what we will do is to mark the Student Name property field read-only and we will also replace the gender Text Box field with a dropdownlist. So, now the Student Name field is read-only and Student Gender is now displayed in a dropdownlist control. In the preceding method, notice that the student object is receiving the posted form values.