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Editorial Team
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Asked: 2026-06-16T09:32:42+00:00

I have a masterpage in which i defined a function for getElementById . function

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I have a masterpage in which i defined a function for getElementById .

function Clear() {
    document.getElementById('<%= NameTextBox.ClientID  %>').value = "";
    document.getElementById('<%= LastNameTextBox.ClientID  %>').value = "";
}

when i use this function in other page it is clearing the element value.

but when i use this code in masterpage, i get error :

The Controls collection cannot be modified because the control
contains code blocks (i.e. <% … %>).

[HttpException (0x80004005): The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).]
 System.Web.UI.ControlCollection.Add(Control child) +9601391
AjaxControlToolkit.ScriptObjectBuilder.RegisterCssReferences(Control control) +691
AjaxControlToolkit.ScriptControlBase.OnLoad(EventArgs e) +44
System.Web.UI.Control.LoadRecursive() +54
System.Web.UI.Control.LoadRecursive() +145
System.Web.UI.Control.LoadRecursive() +145
System.Web.UI.Control.LoadRecursive() +145
System.Web.UI.Control.LoadRecursive() +145
System.Web.UI.Control.LoadRecursive() +145
System.Web.UI.Control.LoadRecursive() +145
System.Web.UI.Control.LoadRecursive() +145
System.Web.UI.Control.LoadRecursive() +145
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +772

if i change my code to :

document.getElementById('<%# NameTextBox.ClientID  %>').value = "";

i don’t get error. but don’t clear myelement.

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1 Answer

  1. Editorial Team

    Looks like you have added mentioned js function in <Head> tag of master page.
    Instead try adding your js function in <form> tag in master page at end.

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