[HttpException (0x80004005): Multiple controls with the same ID '_header' were found. FindControl requires that controls have unique IDs.] System.Web.UI.Control.FillNamedControlsTable(Control namingContainer, ControlCollection controls) +273 System.Web.UI.Control.FillNamedControlsTable(Control namingContainer, ControlCollection controls) +320 System.Web.UI.Control.FillNamedControlsTable(Control namingContainer, ControlCollection controls) +320 System.Web.UI.Control.FillNamedControlsTable(Control namingContainer, ControlCollection controls) +320 System.Web.UI.Control.FillNamedControlsTable(Control namingContainer, ControlCollection controls) +320 System.Web.UI.Control.FillNamedControlsTable(Control namingContainer, ControlCollection controls) +320 System.Web.UI.Control.EnsureNamedControlsTable() +61 System.Web.UI.Control.FindControl(String id, Int32 pathOffset) +222 System.Web.UI.Control.FindControl(String id, Int32 pathOffset) +255 System.Web.UI.Control.FindControl(String id) +12 AjaxControlToolkit.ExtenderControlBase.FindControlHelper(String id) in C:\Users\swalther\Projects\AspNetAjax\Releases\30930\AjaxControlToolkitSource\AjaxControlToolkit\ExtenderBase\ExtenderControlBase.cs:181 AjaxControlToolkit.ExtenderControlBase.FindControl(String id) in C:\Users\swalther\Projects\AspNetAjax\Releases\30930\AjaxControlToolkitSource\AjaxControlToolkit\ExtenderBase\ExtenderControlBase.cs:209 System.Web.UI.ExtenderControl.RegisterWithScriptManager() +72 System.Web.UI.ExtenderControl.OnPreRender(EventArgs e) +19 AjaxControlToolkit.ExtenderControlBase.OnPreRender(EventArgs e) in C:\Users\swalther\Projects\AspNetAjax\Releases\30930\AjaxControlToolkitSource\AjaxControlToolkit\ExtenderBase\ExtenderControlBase.cs:367 System.Web.UI.Control.PreRenderRecursiveInternal() +80 System.Web.UI.Control.PreRenderRecursiveInternal() +171 System.Web.UI.Control.PreRenderRecursiveInternal() +171 System.Web.UI.Control.PreRenderRecursiveInternal() +171 System.Web.UI.Control.PreRenderRecursiveInternal() +171 System.Web.UI.Control.PreRenderRecursiveInternal() +171 System.Web.UI.Control.PreRenderRecursiveInternal() +171 System.Web.UI.WebControls.WebParts.WebPart.PreRenderRecursiveInternal() +42 System.Web.UI.Control.PreRenderRecursiveInternal() +171 System.Web.UI.Control.PreRenderRecursiveInternal() +171 System.Web.UI.Control.PreRenderRecursiveInternal() +171 System.Web.UI.Control.PreRenderRecursiveInternal() +171 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +842
var
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