a page can have only one server-side form tag

Question

I am using master page and when I run this page  it shows the following error message      a page can have only one server-side form tag   How can I solve this problem

User · Answer

Sometime when you render the current page as shown in below code will generate the same error

StringWriter str_wrt = new StringWriter();
HtmlTextWriter html_wrt = new HtmlTextWriter(str_wrt);
Page.RenderControl(html_wrt);
String HTML = str_wrt.ToString();

so how can we sort it?

User · Answer

It sounds like you have a form tag in a Master Page and in the Page that is throwing the error   You can have only one

User · Answer

I think you did like this    lt asp Content ID  Content2  ContentPlaceHolderID  MasterContent  runat  server  gt     lt form id  form1  runat  server  gt     lt  form gt   lt  asp Content gt    The form tag isn t needed  because you already have the same tag in the master page    So you just remove that and it should be working

User · Answer

Does your page contain these  lt asp Content ID  quot Content1 quot  ContentPlaceHolderID  quot ContentPlaceHolder1 quot  Runat  quot Server quot  gt   lt  asp content gt   tags  and are all your controls inside these  You should only have the Form tags in the MasterPage   Here are some of my understanding and suggestion  Html  element can be put in the body of html pages and html page does support multiple  elements  however they can not be nested each other  you can find the detailed description from the W3C html specification  The FORM element http   www w3 org MarkUp html3 forms html And as for ASP NET web form page  it is based on a single server-side form element which contains all the controls inside it  so generally we do not recommend that we put multiple  elements  However  this is still supported in ASP NET page master page  and I think the problem in your master page should be caused by the unsupported nested  element  and multiple  in the same level should be ok  e g  In addition  if what you want to do through multiple forms is just make our page posting to multiple pages  I think you can consider using the new feature for cross-page posting in ASP NET 2 0  This can help us use button controls to postback to different pages without having multpile forms on the page  Cross-Page Posting in ASP NET Web Pages http   msdn2 microsoft com en-us lib   39 VS 80  aspx http   msdn2 microsoft com en-us lib   40 VS 80  aspx

User · Answer

please remove   runat  server    from  form  tag then it will definetly works

User · Answer

Use only one server side form tag   Check your Master page for  lt form runat  server  gt  - there should be only one   Why do you need more than one

[asp.net] a page can have only one server-side form tag

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