Using LINQ to add new elements to a database

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LINQ

Hello All,

When I am trying to use LINQ to insert data in a Database, I am getting a NullReferenceException. Below is the code for the Button Event Handler where I am adding new items to the Database.

protected void Button1_Click(object sender, EventArgs e)
    {
        string connectionString =ConfigurationManager.ConnectionStrings["DatabaseConnectionStrings"].ToString(); 
        MyClassesDataContext context = new MyClassesDataContext(connectionString);

        test t = new test();
        t.fname = TextBox1.Text;
        t.lname = TextBox2.Text;

        
        context.tests.InsertOnSubmit(t);
        context.SubmitChanges();
        ListBox1.DataBind();



    }

When i press the Button, it points to "string connectionString =ConfigurationManager.ConnectionStrings["DatabaseConnectionStrings"].ToString();" stating that "Use the "new" keyword to create an object instance"



I guess there is an error in the declaration of the connectionString, but I am unable to figure it out.

Many Thanks in Advance.