Server Error in '/' Application.

Control 'main_TreeView1' of type 'TreeView' 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 'main_TreeView1' of type 'TreeView' 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 'main_TreeView1' of type 'TreeView' must be placed inside a form tag with runat=server.]
   System.Web.UI.Page.VerifyRenderingInServerForm(Control control) +9863939
   System.Web.UI.WebControls.TreeView.AddAttributesToRender(HtmlTextWriter writer) +45
   System.Web.UI.WebControls.WebControl.RenderBeginTag(HtmlTextWriter writer) +20
   System.Web.UI.WebControls.TreeView.RenderBeginTag(HtmlTextWriter writer) +93
   System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer) +20
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +67
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +101
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +27
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +129
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +14
   System.Web.UI.WebControls.WebControl.RenderContents(HtmlTextWriter writer) +12
   System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer) +32
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +67
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +101
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +27
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +129
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +14
   System.Web.UI.WebControls.WebControl.RenderContents(HtmlTextWriter writer) +12
   System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer) +32
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +67
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +101
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +27
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +129
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +14
   System.Web.UI.WebControls.WebControl.RenderContents(HtmlTextWriter writer) +12
   System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer) +32
   System.Web.UI.WebControls.CompositeControl.Render(HtmlTextWriter writer) +40
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +67
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +101
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +27
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +129
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +14
   System.Web.UI.Page.Render(HtmlTextWriter writer) +30
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +67
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +101
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +27
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1342


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4700.0