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Oct 31st, 2009

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How to Close User Control?

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hi, i am having problem with closing user control.

i have some function in my parent form(with panel2):

c# Syntax (Toggle Plain Text)
public void ActivateUserControlOne()
{
            panel2.Controls.Clear();
            UserControlOne = new UserControlOne();           
            panel2.Controls.Add(this.UserControlOne);
}
public void ActivateUserControlOne()
{
            panel2.Controls.Clear();
            UserControlOne = new UserControlOne();           
            panel2.Controls.Add(this.UserControlOne);
}

...and UserControlOne appears.
i want to close(remove) UserControlOne on Cancel()(Cancel is function in UserControlOne) and load another User Control (UserControl2) to panel2:

c# Syntax (Toggle Plain Text)
public void Cancel()
{
	    this.Parent.Controls.Remove(this);
 
}
public void Cancel()
{
	    this.Parent.Controls.Remove(this);

}

any ideas how to do that?!

Last edited by peter_budo; Nov 2nd, 2009 at 7:26 pm. Reason: Keep It Organized - For easy readability, always wrap programming code within posts in [code] (code blocks)

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Nov 1st, 2009

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Re: How to Close User Control?

since you always clear the controls on the panel first, seems like it will always be the only control on the panel, so panel2.controls. clear(); should work.

but you could also use panel2.Controls[0].Remove();
seems like there could be several ways to go about it.
you could even expose the panel2 as a public property of the form and modify its contents directly through the property.

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Nov 1st, 2009

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Re: How to Close User Control?

milosz: What happens when your code runs? I haven't tested it but it looks like it should run OK...

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Nov 1st, 2009

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Re: How to Close User Control?

Click to Expand / Collapse Quote originally posted by Diamonddrake ...

since you always clear the controls on the panel first, seems like it will always be the only control on the panel, so panel2.controls. clear(); should work.

but you could also use panel2.Controls[0].Remove();
seems like there could be several ways to go about it.
you could even expose the panel2 as a public property of the form and modify its contents directly through the property.

yes, that's ok. my code works too. but i want to in usercontrolone on Cancel close that control(that is done) and load another usercontrol(UserControl2). funny thing is that the panel2 is already a public property and i can't access it from UserControl2 (or i don't know how

should i access panel2 with following code:
string test = this.Parent.Name; //doesn't work, parent is NULL ?!

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Nov 1st, 2009

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Re: How to Close User Control?

Click to Expand / Collapse Quote originally posted by sknake ...

milosz: What happens when your code runs? I haven't tested it but it looks like it should run OK...

my code is ok. UserControlOne disappears from panel2. But I want somehow to enable for UserControlTwo to appear when I close UserControlOne. I can do that by using events, but is there any other way?

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Nov 2nd, 2009

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Re: How to Close User Control?

you create an event handler from a button on the usercontrol in the main form then just do the removing there, Could be a lot of solutions.

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Nov 3rd, 2009

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Re: How to Close User Control?

so what are they?! please post example for some solutions, because i tried creating event handler, but i think it's too complicated to do that.

Click to Expand / Collapse Quote originally posted by Diamonddrake ...

you create an event handler from a button on the usercontrol in the main form then just do the removing there, Could be a lot of solutions.

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Nov 5th, 2009

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Re: How to Close User Control?

on the usercontrol's cs file create an event delegate and event like so

C# Syntax (Toggle Plain Text)
        public delegate void onMyEventHandler(object sender, EventArgs e);
        public event  onMyEventHandler OnMyEvent;
        public delegate void onMyEventHandler(object sender, EventArgs e);
        public event  onMyEventHandler OnMyEvent;

then when the usercontrol needs to tell the form its time to be removed. just call that event

C# Syntax (Toggle Plain Text)
OnMyEvent(this, new EventArgs(null));
OnMyEvent(this, new EventArgs(null));

on the main form you just create your event handlers as usual.

C# Syntax (Toggle Plain Text)
usercontrol myUserControl = new usercontrol();
 
myUserControl.OnMyEvent += new myUserControl.onMyEventHandler(catchevent);
 
void catchevent(object sender, EventArgs e)
{
     Panel2.Controls.remove(((control)sender));
     //or Panel2.Controls.Clear();
}
usercontrol myUserControl = new usercontrol();

myUserControl.OnMyEvent += new myUserControl.onMyEventHandler(catchevent);

void catchevent(object sender, EventArgs e)
{
     Panel2.Controls.remove(((control)sender));
     //or Panel2.Controls.Clear();
}

something simple that that should work. sorry its been a while since I have been on because I have been really busy.

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Nov 6th, 2009

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Re: How to Close User Control?

thank you for support. your posts was very helpful.
i find my way to display another usercontrol after closing one:
in usercontrols you should add:

C# Syntax (Toggle Plain Text)
private void butnCancel_Click(object sender, EventArgs e)
        {
            this.Parent.Controls.Remove(this);       
        }
private void butnCancel_Click(object sender, EventArgs e)
        {
            this.Parent.Controls.Remove(this);       
        }

make sure that cancel button is public. In main form you should create eventhandler for usercontrol:

C# Syntax (Toggle Plain Text)
 
public void OnCancelUserControlOne(object sender, EventArgs e)
        {
            //MessageBox.Show("oops!");
            panel2.Controls.Clear();
            MyUserControlTwo userControlTwo=new MyUserControlTwo();
            panel2.Controls.Add(userControlTwo);
        }
 
public void OnCancelUserControlOne(object sender, EventArgs e)
        {
            //MessageBox.Show("oops!");
            panel2.Controls.Clear();
            MyUserControlTwo userControlTwo=new MyUserControlTwo();
            panel2.Controls.Add(userControlTwo);
        }

also add in mainform constructor following code:

C# Syntax (Toggle Plain Text)
userControlOne=new MyUserControlOne();
this.userControlOne.Click += new EventHandler(OnCancelUserControlOne);
userControlOne=new MyUserControlOne();
this.userControlOne.Click += new EventHandler(OnCancelUserControlOne);

That works

So this issue is finally resolved

Thank you all once again.

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Feb 19th, 2010

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Re: How to Close User Control?

this code works
I've tried it for vb

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