fejl hvorfor

Hej.
jeg har et problem. jeg sad og designet min hjemmeside (og det skal lige siges at jeg ikke har skrevet nogen kode i nu).
og jeg vil lige se hvordan det så ud i explore så jeg trykkede F5 (run) og så kom den med denne fejl.


Server Error in '/e-mail' Application.

Control 'TextBox1' of type 'TextBox' must be placed inside a form tag with runat=server.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: Control 'TextBox1' of type 'TextBox' must be placed inside a form tag with runat=server.

Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[HttpException (0x80004005): Control 'TextBox1' of type 'TextBox' must be placed inside a form tag with runat=server.]
  System.Web.UI.Page.VerifyRenderingInServerForm(Control control)
  System.Web.UI.WebControls.TextBox.AddAttributesToRender(HtmlTextWriter writer)
  System.Web.UI.WebControls.WebControl.RenderBeginTag(HtmlTextWriter writer)
  System.Web.UI.WebControls.TextBox.Render(HtmlTextWriter writer)
  System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
  System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
  System.Web.UI.Control.Render(HtmlTextWriter writer)
  System.Web.UI.WebControls.WebControl.RenderContents(HtmlTextWriter writer)
  System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer)
  System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
  System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
  System.Web.UI.Control.Render(HtmlTextWriter writer)
  System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
  System.Web.UI.Page.ProcessRequestMain()


jeg kan ikke finde ud af hvad der er galdt :(

Håber i kan hjælpe mig.

Nicklas