Are you hooking both of your user control instances up to the same click event handler?  If so, then all you need to do to check which one fired the event would be something like:

private void userControl_Click(object sender, EventArgs e)
{
  if (sender == userControl1)
  {
    // You clicked userControl1
  }
  else if (sender == userControl2)
  {
    // You clicked userControl2
  }
}

Are you hooking both of your user control instances up to the same click event handler?  If so, then all you need to do to check which one fired the event would be something like:

private


 void


 userControl_Click(object


 sender, EventArgs e)
{
  if


 (sender == userControl1)
  {
    // You clicked userControl1



  }
  else


 if


 (sender == userControl2)
  {
    // You clicked userControl2



  }
}

The form knows the difference between the controls.  You'll need to raise your own event in the button's Click event handler so that the form can do the right thing.

---

Hans Passant.

I don't know what "call the usercontrol" means.  Explain why this is important, why does a user control need to know that any other user control is present?

---

Hans Passant.

This doesn't make sense.  When you have 3 user controls, you'll have 3 text boxes, not one.

---

Hans Passant.

In the designer for the user control (not the form that it goes on) just double click the button and put in your code to set the text of the text box to whatever you want.

When you add the user control you've created to the form, each user control will know to use their own controls.  e.g. the button in your first user control will only be aware of the text box in that control.  Same goes goes for any additional instances of the user control you create - they only know about their own controls.  Hope this makes sense!

In the designer for the user control (not the form that it goes on) just double click the button and put in your code to set the text of the text box to whatever you want.

When you add the user control you've created to the form, each user control will know to use their own controls.  e.g. the button in your first user control will only be aware of the text box in that control.  Same goes goes for any additional instances of the user control you create - they only know about their own controls.  Hope this makes sense!

Is it possible when i click on @2, , T will be updated with title of @2 and its coordinate of clicking on the graph?
when i click on @3, , T will be updated with title of @3 and its coordinate of clicking on the graph?

Is it possible when i click on @2, , T will be updated with title of @2 and its coordinate of clicking on the graph?
when i click on @3, , T will be updated with title of @3 and its coordinate of clicking on the graph?

He is talking about runtime.  You haven't made this clear, there are 3 T's.  Which of those 3 T's should be updated with the coordinate?

Pre-empting this, there should be only one T.  It should be a separate TextBox on the form, not part of the UC.  You'll need to raise an event in your UserControl so that the form can update T.

---

Hans Passant.

Again, what some of us are having trouble understanding, is what you mean by "call the UC at run time". How about this: could you post some relevant code (not everything , just the relative snippets) and maybe then we can understand what you're doing and what you're asking.

---

~~Bonnie Berent [C# MVP]

(new blog --- not many posts yet --- be patient)
geek-goddess-bonnie.blogspot.com

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class myControl : UserControl
    {
        public myControl()
        {
            InitializeComponent();
        }

        public string Text1
        {
            get
            {
                return textBox1.Text;
            }
            set
            {
                textBox1.Text = value;
            }
        }


    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnAddUC_Click(object sender, EventArgs e)
        {
            myControl mc = new myControl();
            flowLayoutPanel1.Controls.Add (mc); // here is what i called adding UC at run time...
        }



    }
}