Make the PagerTemplate of GridView to always visible

To show GridView's PagerTemplate row to be visible all the time use the GridView.BottomPagerRow.Visible = true; after calling the DataBind() method.

Prevent user from double clicking an ASP.NET button

The snippet below will disable the asp.net standard button control once the user already clicked it.

<asp:button id="btnSubmit" Text="Submit" onclick="btnSubmit_Click" OnClientClick="this.disabled = true; this.value = 'Submitting...';" UseSubmitBehavior="false" />

XmlWriter defaults to UTF-16 encoding

Whatever your case, you might find a need to alter the encoding type when you are using the XmlWriter class to anything other than UTF-16 which is the default in .NET. I like simplicity so a quick string manipulation will suffice .

private static string SerializeIt(object item)
{
try
{
System.Text.StringBuilder sb = new System.Text.StringBuilder();
using (XmlWriter writer = XmlWriter.Create(sb))
{
XmlSerializer sr = new XmlSerializer(item.GetType());
if (writer != null) sr.Serialize(writer, item);
}
//change the encoding back to UFT-8
sb.Replace(Encoding.Unicode.WebName, Encoding.UTF8.WebName);
return sb.ToString();
}
catch (Exception ex)
{
//do something.
}
}

Download Location of System.Net.WebClient.DownloadFile()

The file will be downloaded by the API depending on where the executing program is running.

i.e. if you have this method declared in a class library, and that class library is consumed in the main appplication, then the file will be downloaded in the main application's bin directory.