opening and closing forms

Question

Hello,

I can not get the second form to completly close.

On form 1, I perform

if (m_FrmIdentify == null)

{

nFrmIdentify = new frmIdentify();

}

if (m_FrmIdentify.Visible == true)

{

FrmIdentify.Loadss();

}

else

{

mFrmIdentify.Show();

}

In form 2, on close

I tried callinig this.close() and this.hide(); Neiter of which make the call above mFrmIdentify == null

so that I can reopen the same form again.

THanks.

Sam · Answer

Hi, I think your problems is that by default when you close a form the form's Dispose() method is called. This causes an exception when methods of the form are called but doesn't make the varibale to the form == null. A possible solution is to handle the 2nd form's FormClosing event like so: private void Form2_FormClosing( object sender, FormClosingEventArgs e) { e.Cancel = true ; this .Hide(); } Hope this helps, Sam

j_sen21 · Answer

Sorry I reposted here, I just got sloppy. Its one form. Loadss is just a random function that it performs if the form has already been created and is visible. //does this check because if its already created and open, then it wont create another form I cant create a new form everytime, only when its not already created and open. if (mFrmIdentify == null) { //creates a new form if one is not open. mFrmIdentify = new frmIdentify(); } else { //When a user interacts with the first form while form mFrmIdentify is already open it comes in here. if (mFrmIdentify.Visible) { //just a function that it calls if the form is open mFrmIdentify.L oadss(); } else { mFrmIdentify.Show(); } } Thanks.

Jan Montano · Answer

I'm a little bit confused with the code. You mentioned you have 2 forms, but you introduced 3 variables, namely m_FrmIdentify, nFrmIdentify and mFrmIdentify. You have a frmIdentify Class but you also called FrmIdentify.Loadss() which I'm guessing FrmIdentify is another class? What's the definition/name of your form1 & form2? I'm assuming form2 is m_FrmIdentify?. You could try to just Hide m_FrmIdentify instead of closing it then check if it is visible or not. Here's my suggestion... if (m_FrmIdentify == null) { //nFrmIdentify = new frmIdentify(); } else { if (m_FrmIdentify.Visible) { //FrmIdentify.Loadss(); } else { //mFrmIdentify.Show(); } }

j_sen21 · Answer

No, it will only stay visible as long a user doesnt close it (mFrmIdentiy.close()) Because a user can still change things on form 1, mFrmIdentiy updates because it is still open (mFrmIdentify != null) and visible. Otherwise if mFrmIdentity is not open, it opens it. Thanks. I guess the only thing that does work is this line if (mFrmIdentify == null ) in form 1, then do something. It works the first time when mFrmIdentify form hasnt been opened yet. But then I close mFrmIdentify, and then try to reload the form again, it thinks that mFrmIdentify is not null anymore. I need to null mFrmIdentify from the closing event or other code that performs the same operation. I was thinking of writing a integer to a file to say the form is open or closed.

Richard Blythe · Answer

I'm not sure what your trying to accomplish by all this. Are you trying to make a form that will always stay visible? If a better way would be to trap the form's "FormClosing" event and set the cancel property to true. e.Cancel = true ; If this hasn't answered your question, please write back. Cheers! Richard