Asp.net: Open a website in iframe from code behind

In this article I am going to explain how to open a website in iframe from code behind in asp.net using C# and VB.net

In the previous article I have explained Nested Datalist example in asp.net usingC# and VB.net, how to create the autocomplete textbox in asp.net MVC usingJquery and Dynamic vertical expanding and collapsing menu using jquery inasp.net.

Description:

An iframe will always load an entire web page within a web page.   User will enter the website url in textbox and hit the click here button, website will be open iframe.

Implementation:

HTML Markup of webform:

  <table>

    <tr><td>Enter Website:</td><td><asp:DropDownList ID="DropDownList1" runat="server">

        <asp:ListItem>http://</asp:ListItem>

        <asp:ListItem>https://</asp:ListItem>

        </asp:DropDownList></td><td><asp:TextBox ID="txturl" runat="server"></asp:TextBox></td><td> <asp:Button ID="btnadd"

            runat="server" Text="Click Here "/></td></tr>  

       <tr>

       <td colspan="4">         

       </td>

       </tr>

    </table>

     <table>

       <tr><td><iframe id="frame1" width="1100px" height="500px" runat="server"></iframe></td></tr>

       </table>            

Add the namespace

C# code:

using System.Web.UI.HtmlControls;

VB.net Code:

Imports System.Web.UI.HtmlControls

On button click write the below given code:

C# code:

protected void Page_Load(object sender, EventArgs e)

    {

        frame1.Visible = false;

    }

    protected void btnadd_Click(object sender, EventArgs e)

    {      

        HtmlControl frame1 = (HtmlControl)this.FindControl("frame1");

        frame1.Visible = true;

        string text= DropDownList1.Text + txturl.Text;

        frame1.Attributes["src"] = text;

    }

VB.net Code:

Protected Sub Page_Load(sender As Object, e As System.EventArgs) Handles Me.Load

        frame1.Visible = False

    End Sub

    Protected Sub btnadd_Click(sender As Object, e As System.EventArgs) Handles btnadd.Click

        Dim frame1 As HtmlControl = DirectCast(Me.FindControl("frame1"), HtmlControl)

        frame1.Visible = True

        Dim text As String = DropDownList1.Text + txturl.Text

        frame1.Attributes("src") = text

    End Sub

Build, run the project and test it.

 Demo:

 In this article we have learn how to open website in iframe from code behind in asp.net using  C# and VB.net. I hope you enjoyed this article. Please post you comment, query and feedback about this article. You can like me on Facebook, Google+, Linkedin and Twitter via hit on Follow us Button and also can get update follow by Email.