You can't mix XSLT and ASP tags like that in Umbraco. To use XSLT, you write a separate .xslt file and include it as a macro in your master page. e.g.:

<umbraco:Macro Alias="MyMacro" runat="server"/>

ou can use xslt macro or user control macro, it's look like you  need a form with asp net controls.

create new project in visual studio and add web user control then do the cosding as you need on page load you can set values to text box, you can use umbraco functions / methods using umbraco.dll  add reference to your project

then build the project. 

copy web user control ".ascx" file to your web site usercontrols folder

copy your project .dll file (find it in project bin folder) to web site bin folder

then open cms and go to developer section, go to macros , create new  macro from the drop down select your .net user control

then save (tick the box says use in editor)

now is you go to content area  - page  in cms , you can see the add macro icon on rich text editor, add the above macro,and publish.

 you can see the form in page.

you can find simple examples in umbraco tutorials (tv)

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