Can an ASP.Net asp:ControlParameter ControlID be a public shared variable instead of an asp:label?

Can an ASP.Net asp:ControlParameter ControlID be a public shared variable instead of an ASP:label?

We were using an asp:label as a parameter for a DataSource but now want to use a public shared variable instead of the label.

This is the markup of the parameter using the asp:label.

<asp:ControlParameter 
    ControlID="LabelCheckBoxMonday" 
    Name="DayOfWeekMonday" 
    PropertyName="Text" 
    Type="String" />

We added this public shared variable in the code-behind.

Public Shared blnDayOfWeekMonday As Boolean

We changed the markup for the parameter to this.

<asp:ControlParameter 
    ControlID="blnDayOfWeekMonday" 
    Name="DayOfWeekMonday" 
    PropertyName="Text" 
    Type="String" />

This is the coding that places values into the variable. The original coding that used to do that for the label is commented out.

Protected Sub ImageButtonInsertDayOfWeekMonday_Click(sender As Object, e As ImageClickEventArgs)

    Dim imgTheImageButton As New ImageButton

    imgTheImageButton = DetailsView.FindControl("ImageButtonInsertDayOfWeekMonday")

    If imgTheImageButton.ImageUrl = "../../Images/checked.png" = True Then

        imgTheImageButton.ImageUrl = "../../Images/unchecked.png"
        '            LabelCheckBoxMonday.Text = False
        blnDayOfWeekMonday = False
    Else

        imgTheImageButton.ImageUrl = "../../Images/checked.png"
        '           LabelCheckBoxMonday.Text = True
        blnDayOfWeekMonday = True
    End If
End Sub

All of this is part of the following InsertCommand:

    InsertCommand=
        "INSERT INTO [TeacherSchedule] 
            ([DayOfWeekMonday], 
             [DayOfWeekTuesday], 
             [DayOfWeekWednesday], 
             [DayOfWeekThursday], 
             [DayOfWeekFriday], 
             [DayOfWeekSaturday], 
             [DayOfWeekSunday], 
             [StartTime],
             [EndTime],
             [ClassID],
             [TeacherID]) 
        VALUES (@DayOfWeekMonday, 
                @DayOfWeekTuesday, 
                @DayOfWeekWednesday, 
                @DayOfWeekThursday, 
                @DayOfWeekFriday, 
                @DayOfWeekSaturday, 
                @DayOfWeekSunday, 
                @StartTime, 
                @EndTime,
                @ClassID,
                @TeacherID)"

When the web form is running nothing happens after changing it to the public shared variable.

Can you tell me what else I need to do to proceed?

* Update *

Using Marks suggestion I found out how to do an asp:QueryStringParameter but still don't know how to populate it with a value. This is the parameter as an asp:QueryStringParameter

<asp:QueryStringParameter
    Name="DayOfWeekMonday" 
    QueryStringField="QSDayOfWeekMonday" />

How do I populate QSDayOfWeekMonday in the ImageButtonInsertDayOfWeekMonday_Click sub routine?

I tried:

QSDayOfWeekMonday = False

but got a "not declared" error.

* Full markup and code-behind coding *

http://pastebin.com/embed_js.php?i=kye3c2U8

Solution

Another option is to use a Parameter as:

<asp:Parameter Name="DateOfWeekMonthly" />

And in code set the DefaultValue property to the value you want to specify, as in:

DataSourceControl1.Parameters["DateOfWeekMonthly"].DefaultValue = someVariable;

This has worked for me.

You could establish this event in the Selecting event that fires; this event fires before the select happens; therefore, you can establish the boolean value. I believe here, you can add it to the collection of values defined in the event argument.