How to find Html control value in code behind using C# in ASP.Net

Hi all of you,

I am createing one application using html controls. I have one master page and one child page. I have added html text box controls on child page. Now I want to get that html textbox value code behind on POST action.

If I don not use ContentPlaceHolder or Master page so I am able to do this. But with ContentPlaceHolder or child page I am unable to do this.

Please help me.

Thank you so much.