Open a website in iframe from code behind - ASPMANTRA | Asp.Net,MVC,AngularJs,Jquery,Javascript,Sql Server AND WCF snippets and tutorial 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 using C# and

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.

HTML Markup of webform:
    <tr><td>Enter Website:</td><td><asp:DropDownList ID="DropDownList1" runat="server">
        </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>  
       <td colspan="4">         
       <tr><td><iframe id="frame1" width="1100px" height="500px" runat="server"></iframe></td></tr>

Add the namespace
C# code:

using System.Web.UI.HtmlControls; 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;
    } 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.
Open a website in iframe from code behind

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