Hiding/blocking tabs using windows forms in c#

Question

The thing is that i have a 'log in window' and a 'mainwindow' that is called after pressing the log in button or the "VISITANT" button If pressing the log in button, the whole system will come out, and if i press the VISITANT button, one tab should disappear or be blocked or something. ``` private void visitant(object sender, EventArgs e) { mainwindow menu = new mainwindow(); menu.Show(); //mainwindow.tabPage1.Enabled = false; //attempt1 //mainwindow.tabPage1.Visible = false; //attempt1 //System.Windows.Forms.tabPage1.Enabled = false;//attempt2 //System.Windows.Forms.tabPage1.Visible = false;//attempt2 this.Hide(); } ``` the errors i get for using the attempt1 are Error 1 'System.mainwindow.tabPage1' is inaccessible due to its protection level' Error 2 An object reference is required for the non-static field, method, or property 'System.mainwindow.tabPage1' and the one i get for using the attempt2 is Error 1 The type or namespace name 'tabPage1' does not exist in the namespace 'System…

Accepted Answer

The controls you add to your form are, by default, not publicly visible. Your "attempt1" code would be the correct code, except for this detail.

(EDIT: to fix it this way, change the "Modifiers" property of `tabPage1` to be `Public` or `Internal` - this allows other classes to see those controls from outside the form.)

However, a better approach than making these controls visible would be to create a new public method on your `mainwindow` class, something like this:

```
public void HideTab()
{
   tabPage1.Enabled = false;
   tabPage1.Visible = false;
}
```

Then, in your sample code, call your new method after you create/show the form:

```
 mainwindow menu = new mainwindow();
 menu.Show();
 menu.HideTab();
```

Hiding/blocking tabs using windows forms in c#

Solution

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