Unknown server tag 'asp:ComboBox'(AjaxToolkit)

Question

HI,

I am using AjaxTookit version 3.5.40412.0 for developing web apps in VS2008.

i am using combobox control in my page but once i run the apps it showing "Unknown server tag 'asp:ComboBox'"

please help me how to resolve this issue.

Regards,
Jeevan.

jeevan mummadi · Answer

Hi Sutish, I uninstalled and installed new AjaxToolKit version 3.5.40412.0 And i created one new page with Ajax Combobox with ScriptManger and Updatepanel. Code : http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd "> http://www.w3.org/1999/xhtml " > q c madhu kumar jani this time i am getting this error. Microsoft JScript runtime error: AjaxControlToolkit requires ASP.NET Ajax 4.0 scripts. Ensure the correct version of the scripts are referenced. If you are using an ASP.NET ScriptManager, switch to the ToolkitScriptManager in AjaxControlToolkit.dll. why AjaxTookit version 3.5.40412.0 will not support Scriptmanager and updatepanel ? And i deleted scriptmanager and update panel from above code and added ToolKitScriptManger then i run the page. Now its working fine. But in real time i developed my asp pages are using script manger and updatepanel. give me solution? Regards, Jeevan.

Suthish Nair · Answer

Its seems a TagPrefix error, but in your case i think might due to AjaxControlToolKit. Remove all entries, references, reinstall, download a new version, install it and add it as reference and try. Before that create a simple another page and build a combo box, if no probs exists try removing obout.

Ankit Nandekar · Answer

plz try with prefix cc1 instead of asp1 may be it will help u bcoz as sutish sir told that ur error is related to tagprifix.

jeevan mummadi · Answer

Hi All, I added system.web.extension dll and ajaxtoolkit dll and i changed TagPrefix as "asp" to "asp1" . Still i am getting same error " Unknown server tag 'asp:ComboBox' ". this is my actual code please look into this. .style2 { height: 39px; } .TrReceiptHight { height:11px; font-size: 9px; font-family:Arial; } .ReceiptTableBorder { /* border:dashed 1px #000000 ; */ width:210px; } .TrBigFont { height:13px; font-size: 11px; font-family: Arial; } function printdiv(printpage) { var headstr = " "; var footstr = " "; var newstr = document.all.item(printpage).innerHTML; var oldstr = document.body.innerHTML; document.body.innerHTML = headstr + newstr + footstr; window.print(); document.body.innerHTML = oldstr; } Customer Entry --%> Customer Name AutoPostBack="True" FolderStyle="" > --%> > runat="server" InitialValue="" ErrorMessage="Please Enter CustomerName" ValidationGroup="Validate"> validationexpression="^[a-zA-Z\s]+$" Display="Dynamic" errormessage="Please Enter Proper Name" ValidationGroup="Validate" /> Basic Charges (Rs) : 0 Customer Mobile Number AutoPostBack="True" FolderStyle="" > --%>   runat="server" Display="Dynamic" ErrorMessage="Please Enter Customer Mobile Number" ValidationGroup="Validate"> Display="Dynamic" ErrorMessage="Please Enter Only Numbers" ValidationExpression="^\d+$" ValidationGroup="Validate"> --%> controltovalidate="txtmobileno" validationexpression="^[0-9]{10}$" errormessage="Enter Valid Mobile Number" ValidationGroup="Validate" /> Font-Size="Small" ForeColor="Blue"> : ForeColor="Black" Text="0"> Drop Location AutoPostBack="True" onselectedindexchanged="ddCabNo_SelectedIndexChanged"> --%> FolderStyle="" MaxLength="50"> --%> onselectedindexchanged="oddlLocations_SelectedIndexChanged" Width="180px" Height="180px" AutoPostBack="True"> jeevan kumar kiran ErrorMessage="Select CabNo" InitialValue="--Select CabNo--" Width="120"> --%> ErrorMessage="Please Enter Drop Location" InitialValue="--Select--" Width="186px" Height="16px" ValidationGroup="Validate">   Font-Size="Small" ForeColor="Blue"> : ForeColor="Black"> Terminal runat="server" AutoPostBack="True" onselectedindexchanged="oddlTerminal_SelectedIndexChanged"> runat="server" Display="Dynamic" InitialValue="--Select--" ErrorMessage="Please Select Terminal" FolderStyle="" ValidationGroup="Validate"> ForeColor="Blue"> : ForeColor="Black"> Payment Mode ForeColor="Black" oncheckedchanged="rbCash_CheckedChanged" AutoPostBack="True" /> ForeColor="Black" oncheckedchanged="rdCard_CheckedChanged" AutoPostBack="True" /> ForeColor="Black" oncheckedchanged="rbCorporate_CheckedChanged" AutoPostBack="True" /> Font-Bold="True">Total Charges (Rs) : ForeColor="Black" Font-Bold="True">0 FolderStyle="" runat="server" OnClick="btnSubmit_Click" ValidationGroup="Validate" > OnClick="btnClear_Click" CausesValidation="False"> CausesValidation="False" onclick="btnRefresh_Click"> runat="server" CssClass="ErrorText" Font-Bold="True" Font-Size="Small" ForeColor="Blue"> runat="server" CssClass="ErrorText" Font-Bold="True" Font-Size="Small" ForeColor="Blue"> runat="server" CssClass="ErrorText" Font-Bold="True" Font-Size="Small" ForeColor="Blue"> runat="server" CssClass="ErrorText" Font-Bold="True" Font-Size="Small" ForeColor="Blue">   Customer Details At Aiport --%> Cabs Inside Railway Station Serialize="true" AutoGenerateColumns="false" AllowGrouping="true" FolderStyle="~/style/premiere_blue" AllowSorting="true" AllowFiltering="false" AllowPaging="true" AllowPageSizeSelection="false" Width="100%" PageSize="50" Height="300" > runat="server" /> runat="server" /> runat="server" /> runat="server" /> runat="server" /> runat="server" /> In this page i am using Obout controls( third party tools). Regards, Jeevan.

Suthish Nair · Answer

Normally this error occurs when the TagPrefix does not match in source page you are using. try changing to TagPrefix="asp1" because "asp" is a reserved keyword in VS.Net. Might helps. I didn't see any error on this posted code, might error occurred on some other page. Double click the error from error list window.

Ravishankar Singh · Answer

Can you check system.web.extension dll is refered in ur code or not? Also recheck the ajaxcontrol toolkit dll for combobox control by simply adding in Visual studio toolbox.

Ankit Nandekar · Answer

i Think there is a problem in ur ComboBox not in updatepanel or ScriptManager bcoz i dont have comboBox in my web controls it is in windows form .please check ur combobox is it in ur toolbox or not.

jeevan mummadi · Answer

Hi Ankit, Untitled Page jeevan Kumar Arvind raj avinash dinesh i am giving only sample code to u. and i added more asp controls in update panel. Please tell me, this version of Ajax toolkit controls are support scriptmanager and updatepanel. Because of i am using scriptmanager and updatepanel in every page. Regards, Jeevan.

Ankit Nandekar · Answer

can i see ur code.