When you use the protected keyword, then it allows the code-behind to connect to the controls and/or code that is declares in the ASPX page. Any variable that you would want to display in the ASPX page would also need to be protected.
For example:
in Code-behind:
protected string mstrPageTitle;
public void Page_Load()
{
mstrPageTitle = "This is my Title";
}
in ASPX page:
<%=mstrPageTitle%>
In order for the line above to work, it must be a protected variable. I guess you could say that the protected key word allows the code-behind to interact with the variables and objects. If they are private, they are private to the class only and are not shared with the ASPX.
I don't know how clear this is, so let me know if you still have questions. If someone else would like to elaborate more thoroughly, be my guest.
Andrea
"Chris" <> wrote in message news:EPhqc.114250$...
but why does it have to be protected ?
using it as 'private' creates a runtime error ? ==> Object reference not set to an instance of an object.
Chris
"Andrea Williams" <> wrote in message news:...
If you are declaring the Web control in the ASPX form (as It looks like), then you need to change the code in the class.
instead of using:
private WebCalcUserControl WebCalcUserControl1 = new WebCalcUserControl();
Code-Behind inside the Class declaration:
protected WebCalcUserControl WebCalcUserControl1; //The name you declare here, must match the ID on the ASPX page
I hope that helps...
Andrea Williams
"Chris" <> wrote in message news:Wz%pc.112515$...
> Hi,
>
> I have 2 textboxes (txtVal1, txtVal2) in a WebUserControl
> (WebCalcUserControl) for which I write public properties :
>
> public int Value1
> {
> get { return Convert.ToInt32(txtVal1.Text); }
> set { txtVal1.Text = Convert.ToString(value); }
> }
> public int Value2
> {
> get { return Convert.ToInt32(txtVal2.Text); }
> set { txtVal2.Text = Convert.ToString(value); }
> }
>
> Then, I host the user control in a WebForm for which I provide a private
> datamember in the webform :
>
>
> private WebCalcUserControl WebCalcUserControl1 = new WebCalcUserControl();
>
> I add a button (btnAdd) and a Label (lblResult) to the WebForm as well.
>
> Button Event-handler :
> private void btnAdd_Click(object sender, System.EventArgs e)
> {
> lblResult.Text = Convert.ToString(
> WebCalcUserControl1.Value1 +
> WebCalcUserControl1.Value2);
> }
>
> I run the webapp ... enter 2 numbers in the texboxes ... press the
> Add-button .. and get a run-time error : Input string was not in a correct
> format.
> When debugging do i notice that both Text-properties of the textboxes (of
> the user control) are empty ??? (Although I entered values at run-time)
>
> How come ?
>
> Thanks
>
> Chris
>
>
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