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Introduction

In my last article I discussed how to insert data in database using Entity Framework. I am taking the same example and file for this article. In this article I will show how we can select data from database using Entity Framework.

To show data on Form in aspx I am adding gridview on form and writing the selection code in page_load event.

Coding of Selection

	protected void Page_Load(object sender, EventArgs e)
    {
        //object of entity class which holds all methods
        techaltum_efEntities te = new techaltum_efEntities();

        //selection from database using EF
        IEnumerable stu = te.students.ToList();

        //bind this data to database
        GridView1.DataSource = stu;
        GridView1.DataBind();

       
    }
		

Now execute this code and you will get following output:-

how to select data using ef

		Figure 1
 	

Select using Where Clause

As above we show the all records. We can also filter these records using where clause as we used in LINQ.

For example I want to show the records whose name start with I. then we will select in the following way:-

//object of entity class which holds all methods
        techaltum_efEntities te = new techaltum_efEntities();

        //selection from database using EF
        IEnumerable stu = te.students.ToList().Where(x=>x.stu_name.StartsWith("i"));

        //bind this data to database
        GridView1.DataSource = stu;
        GridView1.DataBind();

		

Now execute the code and you will get following output:-

Selection using ef

		Figure 3
		

Email Address

For any query you can send mail at info@techaltum.com
Thanks