Introduction to Data binding

Data binding helps to develop applications where controls can be bound to the values stored in a data source.

Web server controls can be bounded to data source such as an array list, database table dynamically.

The properties of a server control are set to a specific data source and when the application executes, it fetches data from the data source and displays it.

Data bind by using the following syntax:

    <asp:TextBox ID="txtName" Text="Enter Name" runat="server">Enter Name</asp:TextBox>

    <asp:Label ID="lblName" Text="<% #txtName.Text%>" runat="server"/>

The sever control will display the data when the DataBind() method is called on that control.

protected void Page_Load(object sender, EventArgs e)

        {

if (IsPostBack)

{

lblName.DataBind();

}

}

Types of Data binding:

There are two types of data binding available in ASP.NET

•  Single-value data binding
•  Displays the single line of data value at a time from the data source Eg: TextBox and Label Controls
• Multiple values data binding 
• Displays the multi line of data values at a time from the data source Eg: DropDownlist, ArrayList, GridView, ListView etc.

 Eg: Multiple Databinding

protected void Page_Load(object sender, EventArgs e)

        {

            ArrayList arry = new ArrayList();

            arry.Add("First");

            arry.Add("Second");

            arry.Add("Third");

            DropDown1.DataSource = arry;

            DropDown1.DataBind();

       }