Hi I am a bit confused at how to approach this little basic issue.

I have developed a web site that uses the masterpage - main.master

So, Basically I want to add a control to the web page .But all I can see is contentplace holders and they are not allowing me to add the control .

Please advise me how can I add a control to the web page.

Generally when using masterpages you will want to add a content place holder, and then within there you can add other controls (on either the masterpage or a webpage with the reference to your masterpage).

If nothing else shows up in your toolbox other than the content place holder then you will probably need to refresh your Visual Studio toolbox since you should be able to put any normal control inside the content placeholder (textbox, labels, etc.)