Hi nadeem1218,
Refer the below sample.
HTML
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<style type="text/css">
body
{
font-family: Arial;
font-size: 10pt;
}
.modalBackground
{
background-color: Black;
filter: alpha(opacity=60);
opacity: 0.6;
}
.modalPopup
{
background-color: #FFFFFF;
width: 500px;
border: 3px solid #0DA9D0;
padding: 0;
}
.modalPopup .header
{
background-color: #2FBDF1;
height: 30px;
color: White;
line-height: 30px;
text-align: center;
font-weight: bold;
}
.modalPopup .body
{
min-height: 50px;
padding: 5px;
line-height: 30px;
text-align: center;
font-weight: bold;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<cc1:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
</cc1:ToolkitScriptManager>
<asp:TextBox ID="txtUrl" runat="server" Width="300" Text="https://www.youtube.com/watch?v=cWuvnc6u93A" />
<asp:Button ID="btnShow" runat="server" Text="Play Video" OnClick="Play" />
<asp:LinkButton ID="lnkDummy" runat="server"></asp:LinkButton>
<cc1:ModalPopupExtender ID="ModalPopupExtender1" BehaviorID="mpe" runat="server"
PopupControlID="pnlPopup" TargetControlID="lnkDummy" BackgroundCssClass="modalBackground"
CancelControlID="btnClose">
</cc1:ModalPopupExtender>
<asp:Panel ID="pnlPopup" runat="server" CssClass="modalPopup" Style="display: none">
<div class="header">
Youtube Video
</div>
<div class="body">
<iframe id="video" runat="server" width="420" height="315" frameborder="0" allowfullscreen>
</iframe>
<br />
<br />
<asp:Button ID="btnClose" runat="server" Text="Close" />
</div>
</asp:Panel>
</form>
</body>
</html>
C#
protected void Play(object sender, EventArgs e)
{
string[] separatingChars = { "v=" };
string url = "//www.youtube.com/embed/" + txtUrl.Text.Split(separatingChars, StringSplitOptions.RemoveEmptyEntries)[1];
video.Attributes["src"] = url;
ModalPopupExtender1.Show();
}
VB.Net
Protected Sub Play(sender As Object, e As EventArgs)
Dim separatingChars As String() = {"v="}
Dim url As String = "//www.youtube.com/embed/" + txtUrl.Text.Split(separatingChars, StringSplitOptions.RemoveEmptyEntries)(1)
video.Attributes("src") = url
ModalPopupExtender1.Show()
End Sub
Screenshot
