ASP.NET

In a vb.net 2010 web form application, I have the start of code for a master page listed below:

#Region "Private Sub Page_Load(ByVal sender As System.Object, ByVal e As 
System.EventArgs) Handles MyBase.Load" 
    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As 
System.EventArgs) Handles MyBase.Load 
 
        _master = CType(Page.Master, MasterPage) 
        _master.PageTitle = "Attendance" 

In the master page, there is an area to display error messages. When I have decided to place an
error message in the master page, I have made a call to a (static) shared function from an ajax call
to obtain data from the sql server database. The ajax call is made from a javascript function.

Thus can you tell me if there is away that I can access the error section of the of the master page?
Basically I need to have the master page with scope to access.
Thus can you tell me if this is possbile and/or show me the code on how to solve my problem?

I am having a problem with an ajax call to a shared (static) vb.net function to obtain data from the database.
In a vb.net 2010 web form application, I needed to make a call from a javascript function to a shared (static) function to
obtain data from a sql server 2012 database. The first ajax call below is the original call and the second call is the one
I came up by copying the first call.
The problem is the first call always occurs before the second ajax call regardless of what I do with the code. There are cases when I
only want the second call to occur. By stepping through the code, I see that there is alot of jquery code that occurs.
$.ajax({ 
                    type: "POST", 
                    contentType: "application/json; charset=utf-8", 
                    url: document.location.pathname + "/GetStudentLetter", 
                    data: "{ " + strData + " }", 
                    dataType: "json", 
                    success: function (data) { 
                        LoadEditor(JSON.parse(data.d), milestone); 
                    }, 
                    error: AjaxFailed 
                });            
            if (milestone == '999') { 
                $.ajax({ 
                    type: "POST", 
                    contentType: "application/json; charset=utf-8", 
                    url: document.location.pathname + "/Gettattschyr", 
                    data: "{ " + strData + " }", 
                    dataType: "json", 
                    success: function (data) { 
                        successtest(eval(data));                       
                    }, 
                    error: AjaxFailed 
                }); 
            }                
         }           
        function successtest(sletter) { 
            var sle = sletter 
            _txtattschyr = sletter.d 
            if (_txtattschyr > '1') { 
                alert('You have selected student(s) having more than one Entry for the current school year. '); 
                return                 
            }               
        } 

Thus would you tell me what you think is wrong and/or tell me how I can change the second ajax call to try to solve this issue?   

<asp:TemplateField HeaderText="Student Name" ItemStyle-HorizontalAlign="Center" 
ItemStyle-CssClass="ui-widget-content" > 
                                <ItemTemplate > 
                                    <a href="javascript: 
GetStudentLetterTemplate('<%# Eval("schoolyear") %>', '<%# Eval("schoolnum") 
%>', '<%# Eval("milestone_code") %>', '<%# Eval("stulink") %>', '<%# 
Eval("HOMELNGCOR") %>', '<%# Eval("semester") %>');" 
style="color:Blue"><%#Eval("STUDENTNAME")%></a> 
                                </ItemTemplate> 
                            </asp:TemplateField> 

 #Region "Public Shared Function GetDupScoolYear"
<WebMethod()> _
Public Shared Function GetDupScoolYear() As DataTable
    Dim _dt As DataTable = New DataTable()

    Dim Query As String = "SELECT [personID],value, count(*) as Count FROM
   [t].[dbo].[CustomStudent] where attributeID = 2775 and [personID] = 97366 group
   by [personID],value"
    Using con As SqlConnection = DB.OpenConnection()
        Using da As SqlDataAdapter = New SqlDataAdapter(Query, con)

            Try
                da.Fill(_dt)
            Catch ex As Exception

            End Try

        End Using
        End Using
       Return _dt
     End Function
   #End Region

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Create</title>
    <script src="~/scripts/jquery-1.10.2.js"></script>
    <script>
        $(function () {
            $("#CountryId").change(function () {
                $("#citylist").empty();
             //  alert("error");
                var x = $(this).val();
                $.ajax({
                    url: "/empcourse/getcitybyid",
                    data: { id: x },
                    success:function(res)
                    {
                        $.each(res, function (i, e) {
                            $("#citylist").append("<option value='" + e.Id + "'>" + e.CityName + "<option>")

                        });
                    }
                });


            });
            $("#citylist").change(function () {
                $("#districtlist").empty();
                // alert("error");
                var y = $(this).val();
                $.ajax({
                    url: "/empcourse/getdistrictbyid",
                    data: { id: y },
                    success: function (res) {
                        $.each(res, function (i, e) {
                            $("#districtlist").append("<option value='" + e.Id + "'>" + e.DistrictName + "<option>")

                        });
                    }
                });


            });
            $("#CourseId").change(function () {
                var index = 0;
                var id = $(this).val();
                var txt = $("#CourseId option:selected").text();
                $("#tb").append("<tr><td><input type = 'hidden' name='Courses[" + index + "].CourseId' value='" + id + "'/></td><td>" + txt + "</td><td><input type='button' value='remove' class='r'</td></tr>")

                index++;
            });
            $("#tb").on("click", ".r", function () {
                $(this).parent().parent().hide();
                $(this).parent().prev().prev().find("input").val("0");
            });
            $("#LanaguageId").change(function () {
                var index1 = 0;
                var id1 = $(this).val();
                var txt1 = $("#LanaguageId option:selected").text();
                $("#tb1").append("<tr><td><input type = 'hidden' name='Langs[" + index1 + "].LanguageId' value='" + id1 + "'/></td><td>" + txt1 + "</td><td><input type='button' value='remove' class='s'</td></tr>")

                index1++;
            });
            $("#tb1").on("click", ".s", function () {
                $(this).parent().parent().hide();
                $(this).parent().prev().prev().find("input").val("0");
            });

            $("#LevelId").change(function () {
                var index2 = 0;
                var id2 = $(this).val();
                var txt2 = $("#LevelId option:selected").text();
                $("#tb2").append("<tr><td><input type = 'hidden' name='Langs[" + index2 + "].LevelId' value='" + id2 + "'/></td><td>" + txt2 + "</td><td><input type='button' value='remove' class='y'</td></tr>")

                index2++;
            });
            $("#tb2").on("click", ".y", function () {
                $(this).parent().parent().hide();
                $(this).parent().prev().prev().find("input").val("0");
            });
        });
    </script>
</head>
<body>
    <div>
        @using (Html.BeginForm())
        {
            <div>
                Name:@Html.TextBoxFor(a=>a.Name)
                <br />
                Salary:@Html.TextBoxFor(a => a.Salary)
                <br />
                Email:@Html.TextBoxFor(a => a.Email)
                <br />
                Country:@Html.DropDownList("CountryId")
                <br />
                City:<select id="citylist" name="CityId"></select>
                <br />
                District:<select id="districtlist" name="DistrictId"></select>
                <br />
                Courses:@Html.DropDownList("CourseId")
                <br />
                <br />

                <table id="tb"></table>
                <br />
                <br />

                Language:@Html.DropDownList("LanaguageId")
                <br />
                <br />

                <table id="tb1"></table>
                <br />
                <br />

                Level:@Html.DropDownList("LevelId")
                <br />
                <br />

                <table id="tb2"></table>
                <br />
                <input type="submit" />
            </div>
        }
    </div>
</body>
</html>

 If (gvAttendanceLetters.DataKeys(0).Values(3) = "999") Then
        _master.Visible = True
       _master.ErrorMessage = "You have entered more the one  record for the current school year for the student you selected "
End If

function GetStudentLetterTemplate(scyear, scnum, milestone, studentnum) {
     if (milestone == '999') {
         alert('You have entered more the one  record for the current school year for the student you selected ');

     }

     });

 }