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How to Close User Control?

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Join Date: Oct 2009

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milosz

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How to Close User Control?

Oct 31st, 2009

hi, i am having problem with closing user control.

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

 Help with Code Tags 
 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:

 Help with Code Tags 
 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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Join Date: Mar 2008

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Diamonddrake Diamonddrake is offline

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Nov 1st, 2009

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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Join Date: Feb 2009

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sknake

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Nov 1st, 2009

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

Scott Knake
Custom Software Development
Apex Software, Inc.

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Join Date: Oct 2009

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milosz

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Nov 1st, 2009

•

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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Join Date: Oct 2009

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milosz

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Nov 1st, 2009

•

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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Join Date: Mar 2008

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Diamonddrake Diamonddrake is offline

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Posting Whiz

Nov 2nd, 2009

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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Join Date: Oct 2009

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milosz

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Nov 3rd, 2009

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.

•

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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Join Date: Mar 2008

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Diamonddrake Diamonddrake is offline

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Nov 5th, 2009

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

 Help with Code Tags 
 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

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 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.

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 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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Join Date: Oct 2009

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milosz

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Nov 6th, 2009

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:

 Help with Code Tags 
 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:

 Help with Code Tags 
 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:

 Help with Code Tags 
 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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