ASP.NET

string GetRenderedOutput<T>(T control) where T : Control
{
    StringBuilder builder = new StringBuilder();
    using (StringWriter sWriter = new StringWriter(builder))
    using (Html32TextWriter writer = new Html32TextWriter(sWriter))
    {
        control.RenderControl(writer);
    }
    return builder.ToString();
}

MailMessage.Body = GetRenderedOutput(Confirmation_div);

MailMessage.Body = GetRenderedOutput<HtmlGenericControl>(Confirmation_div);

string GetRenderedOutput<T>(T control) where T : Control 

bool myMethod<T>(T Object) Where T : Object {}

majee wrote:

the controls which don’t have the ‘name’ attribute wouldn’t maintain its contents on post back.

N a v a n e e t h wrote:

For server controls, the id will be put as name. So what you are saying won't occur. The real issue here is a label render as HTML span and contents of span will not be posted to server. See my latest reply.

document.getElementById("hiddeninput").value = "SOmeText"; // To find the value in server
document.getElementById("LabelID").innerHTML = "SomeText"; // For display purpose only. 

txtbox.Attributes.Add("readonly", "readonly");

txtbox.Readonly = true / txtbox.Enabled = false;