<script type="text/javascript">
        $(document).ready(function () {

            var pathname = window.location.pathname;
            var index = pathname.lastIndexOf("/");
            var filename = pathname.substr(index + 1);

            if (filename == 'Default.aspx' || filename == 'NewSalesUI.aspx' || filename == 'SalesVoid.aspx') {
                $('a[href="' + filename + '"]').attr("class", "main current");
            }
            else {
                index = 0;
                index = pathname.lastIndexOf("Setup");
                if (index > 0) {
                   
                    var elements = $('span .settings');
                    if (elements != null && elements != NaN) {
                        var p = elements.parent().parent();
                        p.attr("class", "main current");
                    }
                    return;
                }

                index = 0;
                index = pathname.lastIndexOf("Operation");
                if (index > 0) {
                    var elements = $('span .operation');
                    if (elements != null && elements != NaN) {
                        var p = elements.parent().parent();
                        p.attr("class", "main current");
                    }
                }

                index = 0;
                index = pathname.lastIndexOf("Account");
                if (index > 0) {
                    var elements = $('span .newsletter');
                    if (elements != null && elements != NaN) {
                        var p = elements.parent().parent();
                        p.attr("class", "main current");
                    }
                    return;
                }

                index = 0;
                index = pathname.lastIndexOf("Report");
                if (index > 0) {
                    var elements = $('span .reports');
                    if (elements != null && elements != NaN) {
                        var p = elements.parent().parent();
                        p.attr("class", "main current");
                    }
                    return;
                }
            }

        });
    </script>

Introduction: 

Here I will explain how to solve the problem “The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).” when running web application using asp.net. 

Description: 

I created one web application and added some of script files in header section of page like this

        ParameterField paramerterField = new ParameterField();
        ParameterFields parameterFields = new ParameterFields();
        ParameterDiscreteValue pdvReprint = new ParameterDiscreteValue();

        private void setParameter()
        {
            string rep = "";

            try
            {
                rep = Request.QueryString["Rep"].ToString();
            }
            catch (Exception ex)
            {
                rep = "";
            }
            if (rep != "")
            {
                paramerterField.ParameterFieldName = "@Reprint";
                pdvReprint.Value = rep;
                paramerterField.CurrentValues.Add(pdvReprint);
                parameterFields.Add(paramerterField);
                CrViewer.ParameterFieldInfo = parameterFields;
            }
            else
            {
                paramerterField.ParameterFieldName = "@Reprint";
                pdvReprint.Value = "";
                paramerterField.CurrentValues.Add(pdvReprint);
                parameterFields.Add(paramerterField);
                CrViewer.ParameterFieldInfo = parameterFields;
            }
        }

Use this course on you child page content place holder

<script language="javascript">
        document.getElementById("setupmenu").className = "main current";
    </script>

do not use in header contenet place holder , it will generate error.


OR

 Using Jqery in Master page

 <script type="text/javascript">
        $(document).ready(function () {
           
            var pathname = window.location.pathname;
            var index = pathname.lastIndexOf("/");
            var filename = pathname.substr(index + 1);
            $('a[href="' + filename + '"]').attr("class", "main current");

        });
    </script>

Use a table valued function like this,

CREATE FUNCTION Splitfn(@String varchar(8000), @Delimiter char(1))     
returns @temptable TABLE (items varchar(8000))       as       begin     
    declare @idx int     
    declare @slice varchar(8000)     

    select @idx = 1     
        if len(@String)<1 or @String is null  return     

    while @idx!= 0     
    begin     
        set @idx = charindex(@Delimiter,@String)     
        if @idx!=0     
            set @slice = left(@String,@idx - 1)     
        else     
            set @slice = @String     

        if(len(@slice)>0)
            insert into @temptable(Items) values(@slice)     

        set @String = right(@String,len(@String) - @idx)     
        if len(@String) = 0 break     
    end   return    
end

and get your variable and use this function like this,

 SELECT i.items FROM dbo.Splitfn(@a,'|') AS i


===============================================================================
Optional
use this function to generate a relation data with other table


create function getTeacherDepartmentSplit()
returns @tempTeacher table (TeacherID nvarchar(50),DepartmentID nvarchar(50))
as
begin

 DECLARE @TeacherID nvarchar(50)
 DECLARE @DepartmentIDs nvarchar(50)

 declare dbCursor cursor for
 SELECT     dbo.Teacher.TeacherID, dbo.Teacher.DepartmentIDs FROM  dbo.Teacher
 open dbCursor
 FETCH NEXT FROM dbCursor INTO @TeacherID,@DepartmentIDs

 While @@FETCH_STATUS = 0
 begin
  insert into @tempTeacher (TeacherID,DepartmentID)
  SELECT @TeacherID,i.items FROM dbo.Splitfn(@DepartmentIDs,',') AS i
 
  FETCH NEXT FROM dbCursor INTO @TeacherID,@DepartmentIDs
 
 end
 close dbCursor
 return
end

 select T.TeacherID,T.DepartmentID from getTeacherDepartmentSplit() as T