<eliassal@online.nospam> wrote:

>Hi, I have a user control which I like to use in several projects (winforms)
>in the same solution. Inside lets say Winapp1 , When adding a reference to
>this control, I can dynamically or statically create it and when running the
>application it is correctly drawn on the form. But when I take out the
>reference to this control in Winapp1, reference it in a utility project,
>then reference the utility project in Winapp1 or Winapp2, instantiate the
>utility.mControl, it doesn't get drawn on the form and I get no errors.
>I did a quick check, I added 2 instances of the user control referenced in
>the utility project to my form, using
>messagebox.show(myform.controls.count), it displays 2 which means that
>controls are added but not being able to be drawn. Of course I double checked
>properties such as visible = true..............
>Thanks in advance for any help

"Linda Liu[MSFT]" wrote:

> Hi Salam,
>
> Based on my understanding, you have Control Library project which contains
> a UserControl and a Class Library project and some Windows Application
> projects in a solution.
>
> If you add add a reference to the Control Library project in the Class
> Library project and then add a reference to the Class Library project in
> the Windows Application projects and then add the UserControl on the form,
> the UserControl doesn't appear on the form when the application is run.
>
> If I'm off base, please feel free to let me know.
>
> I performed a test based on your description, but didn't reproduce the
> problem on my side. The steps of my test are as follows:
>
> 1. Create a solution and add a Control Library project and a Class Library
> project and a Windows Application project to the solution. Add a
> UserControl in the Control Library project.
>
> 2. Derive the Class1 in the Class Library project from the UserControl in
> the Control Library project:
> namespace ClassLibrary1
> {
> public class Class1:WindowsControlLibrary1.UserControl1
> {
> }
> }
>
> 3. Build the solution.
>
> 4. Drag the UserControl from Toolbox and drop it onto the form in the
> Windows Application project. A reference to the Control Library project is
> added to the Windows Application project automatically. Build and run the
> application and the UserControl appears on the form.
>
> 5. Remove the reference to the Control Library project from the Windows
> Application project and add a reference to the Class Library project in the
> Windows Application project.
>
> 6. Add the following lines of code in the Form's Load event handler to add
> the UserControl on the form dynamically:
> private void Form1_Load(object sender, EventArgs e)
> {
> ClassLibrary1.Class1 mycontrol = new ClassLibrary1.Class1();
> this.Controls.Add(mycontrol);
> }
>
> 7. Build the solution. An compilation error occurs:
> The 'WindowsControlLibrary1.UserControl1' is defined in an assembly that is
> not referenced. You must add a reference to the assembly "...".
>
> Is there any difference between your solution and mine?
>
> Sincerely,
> Linda Liu
> Microsoft Online Community Support
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