how to set timer delay in asp.net

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C#

ASP.NET

SQL-Server

Dear All,

am working on asp.net c#,

Iam reading Xml file using url,, its working fine.

I have two buttons on my page as ON and OFF.

When i click on ON button, the status of the xml file relay states will be 1

as....

<inputstates>000000000000000000</inputstates>
<relaystates>0000000000000001</relaystates>

and when i click OFF the status of the XML file relay states will be 0

<inputstates>000000000000000000</inputstates>
<relaystates>0000000000000000</relaystates>

Now, i want to put 10 seconds timer between these 0 and 1
When i click ON button it should be 1 and after 10 seconds it should be 0, same thing must be continued.

Please help.

This is my code for 10 seconds

string url = "http://10.10.14.44/state.xml?relay1state=2&pulsetTime1=10";
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(url);


thanks.