How can I do when form is already open then make a data grid view cell double click event disable and bring to front. in c#

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hi friends
I have 2 forms from 1 and form 2 in c#. form 1 contains a button and when that button click form 2 open. If form 2 is already open make bring to front.
At the situation when form 2 is already open then make a data grid view cell double click event disable and bring to front.
How can I do it?? please help me.

my code is like this. but it shows error

C#

private void btn_addgroup_Click(object sender, EventArgs e)
       {
          
           form_2 myfrm = Application.OpenForms["form_2"] as form_2 ;
           if (myfrm != null)
           {
               
               if (myfrm.WindowState == FormWindowState.Minimized)
               {
                   myfrm.WindowState = FormWindowState.Normal;
               }
               myfrm.Activate();
               myfrm.BringToFront();
               myfrm.Activated += new EventHandler(myfrm_Activated);
              

               return;
           }
           else
           {
               myfrm = new form_2(this);
               myfrm.MdiParent =this.ParentForm ;
               myfrm.Show();
           }
       }

       void myfrm_Activated(object sender, EventArgs e)
       {
           dgv_product.CellDoubleClick -= new DataGridViewCellEventHandler(dgv_product.CellDoubleClick);
       }

Posted 15-Jan-16 23:48pm

Member 12197595

Updated 16-Jan-16 0:21am

v4

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Comments

Richard Deeming 16-Jan-16 6:35am

Are we supposed to guess what the error is?

Click "Improve question" and update your question with the full details of the error. Include the error message and the stack trace, and don't forget to indicate which line of your code the error is thrown from.

BillWoodruff 16-Jan-16 8:05am

"when form 2 is already open then make a data grid view cell double click event disable and bring to front."

Why would you want to disable the DataGridView Cell DoubleClick Event ?

The double click in the DataGridView cell on Form2 hides Form2 ?

Member 12197595 17-Jan-16 22:45pm

show error in this line
dgv_product.CellDoubleClick -= new DataGridViewCellEventHandler(dgv_product.CellDoubleClick);

error is,
The event 'System.Windows.Forms.DataGridView.CellDoubleClick' can only appear on the left hand side of += or -=

When form_2 is activate by clicking the button. then I want to disable the event..

Richard Deeming 18-Jan-16 7:18am

You are trying to remove the event from itself, which will not work. You need to remove the previously subscribed event handler.

Something like this:
dgv_product.CellDoubleClick -= this.dgv_product_CellDoubleClick;

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Wendelius · Answer 1 · 2016-01-16T00:09:00

If I understand the question correctly, you try to manipulate objects in Form2 from outside the form. If this the case, I would suggest not doing so.

Instead create a new method to Form2, for example DisableProductClick. This method should contain the relevant logic that changes how objects in Form2 behave. From the form1 when you find existing form2, just like you call BringToFront, you would call your new method. So the code in form1 would be something like

C#

form 2 myfrm = Application.OpenForms["form2"] as form2 ;
           if (myfrm != null)
           {
               
               if (myfrm.WindowState == FormWindowState.Minimized)
               {
                   myfrm.WindowState = FormWindowState.Normal;
               }
               myfrm.Activate();
               myfrm.BringToFront();
               myfrm.DisableProductClick();
...

Also note that there probably isn't a space in the form name so that should be corrected