Once again excel sheet getting open twice

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I am opening a form called RegisterInput when I call it to open from the main form the excel sheet opens a second time.

Code the fails.

private void cmdRegisterInput_Click(object sender, EventArgs e)
 {
     this.Hide();
     frmRegisterInput pantryForm = new frmRegisterInput();
     pantryForm.Show();
 }

Similar code that works.

private void cmdNewMonth_Click(object sender, EventArgs e)
{
    this.Hide();
    frmNewMonth pantryForm = new frmNewMonth();
    pantryForm.Show();
}

I see no difference between these, and I put brake points in and the line that seemed to open the second excel file is.

frmRegisterInput pantryForm = new frmRegisterInput();

What I have tried:

I put breakpoints in and used F11 to step through the code.
I coped the code that works and used it with the needed modifications

Posted 21-Jul-22 10:38am

PaulaJoannAllen

Updated 23-Jul-22 12:02pm

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Comments

Maciej Los 22-Jul-22 3:22am

Somewhere in your code you create new instance of Excel... That's why you have 2 instances of Excel.
BTW: You can't open the same workbook twice unless you messed up registry entries...

See: How to open same file twice simultaneously in excel 2013[^]

PaulaJoannAllen 22-Jul-22 7:14am

Besides the open statement, what other statement, would create a new instance? From what I have read and understand, the second instance is read-only.

CHill60 22-Jul-22 7:54am

This is going to sound silly but ... try restarting your machine. There may be an instance of the program "stuck" in memory (not the correct technical term!). I used to see this a lot with earlier versions of Visual Studio - for me it used to manifest as not being able to build the solution but it's worth a try to at least discount this as an issue

PaulaJoannAllen 23-Jul-22 14:31pm

Tried that several times with the same results.

2 solutions

Solution 2

I found the problem here,

public static Microsoft.Office.Interop.Excel.Application excelApp = new Microsoft.Office.Interop.Excel.Application();

excelApp was already declared.

Posted 23-Jul-22 12:02pm

PaulaJoannAllen

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OriginalGriff · Accepted Answer · 2022-07-21T11:03:00

Solution 1

So put a breakpoint in the frmRegisterInput constructor and see exactly what it does.

We can't do that for you: we have no access to your code, running or not!

Posted 21-Jul-22 11:03am

OriginalGriff

Comments

PaulaJoannAllen 21-Jul-22 21:08pm

Although I have some programming background, I am new to all this with C#. So sorry if this is real basic.

I put a breakpoint on the line in question and on what I think is the constructor. The second excel file is opened after

frmRegisterInput pantryForm = new frmRegisterInput();

is executed

and before

private System.ComponentModel.IContainer components = null;

namespace RegisterInput
{
partial class frmRegisterInput
{
///

/// Required designer variable.
///

private System.ComponentModel.IContainer components = null;

///

/// Clean up any resources being used.
///

/// <param name="disposing" />true if managed resources should be disposed; otherwise, false.
protected override void Dispose(bool disposing)

It is not making any sense to me.