ASP.NET C# - Access App_Code class WebMethod

So i actually solved the problem below, it seems i cant access the WebMethod in app_code folder, is there any way to do it?

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Im having a problem making this work. Here is my code.

C# Class

Code:

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public class GlobalFunctions
{
    [WebMethod]
    public static string TextBoxCheck(string CurrentText)
    {
        if (string.IsNullOrWhiteSpace(CurrentText))
        {
            CurrentText = string.Empty;
            return CurrentText;
        }
        else
        {
            CurrentText = CultureInfo.CurrentCulture.TextInfo.ToTitleCase(CurrentText);
            return CurrentText;
        }
    }
}

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And here is my javascript

Code:

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function CheckTextbox(textBoxID){
    var textBoxText = document.getElementById(textBoxID).value;
    PageMethods.SendForm(textBoxText, OnSucceeded, OnFailed);
}

function OnSucceeded() {
    alert(CurrentText);
    document.getElementById(textBoxID).value = CurrentText;
}

function OnFailed(error) {
  // Alert user to the error.
  //alert(error.get_message());
}

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What happens is from my javascript, i pass the value of the textbox using the "onblur" and then after i run the WebMethod, it will return the result which i want to be passed to the textbox.

i was using the UpdatePanel control and Scriptmanager and page method is true, what i want is to minimize the data being passed, instead of getting and requesting the data of the whole panel, i only want to get the data of the textbox after running the code.

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is it possible to run the code of the textbox in codebehind like "Textbox_TextChanged" and then retrieving the data using ajax and not update panel.