Question

TabPage keeps being created even the tab page already exists in my tab control.
Please consider my code below:

void button1_Click(object sender, EventArgs e)
{
    TabPage tabPage = new TabPage();
    tabPage.Name = "TestNewTab";
    tabPage.Text = "Tab Page";

    // Check if the tabpage is not yet existing
    if (!tabControl1.TabPages.Contains(tabPage))
    {
        // Add the new tab page
        tabControl1.TabPages.Add(tabPage);
    }
}

What’s wrong with my code?
Thanks.

Answer 1

My guess would be that TabPages.Contains is checking for an object reference, since you’re instantiating a new TabPage every time, it won’t be the same object. Try looping through the tab pages and comparing the Name property instead.