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copied!<p>The <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.tabcontrol.aspx" rel="noreferrer"><code>TabControl</code></a> and its <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.tabcontrol.selectedindexchanged.aspx" rel="noreferrer"><code>SelectedIndexChanged</code></a> event will do what you need.</p> <p>For example, you have a Customer file with a <code>TabControl</code> in its details portion of the form. You want to load lazy-load this customer's transactions when the user clicks the Transactions <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.tabpage.aspx" rel="noreferrer"><code>TabPage</code></a>. Your code should look like this pseudo-code:</p> <pre><code>public partial class CustomerMgmtForm : Form { // Assuming the design already done, so the TabControl control exists on your form. public CustomerMgmtForm() { tabControl1.SelectedIndexChanged += new EventHandler(tabControl1_SelectedIndexChanged); } private void tabControl1_SelectedIndexchanged(object sender, EventArgs e) { switch((sender as TabControl).SelectedIndex) { case 0: // Do nothing here (let's suppose that TabPage index 0 is the address information which is already loaded. break; case 1: // Let's suppose TabPage index 1 is the one for the transactions. // Assuming you have put a DataGridView control so that the transactions can be listed. // currentCustomer.Id can be obtained through the CurrencyManager of your BindingSource object used to data bind your data to your Windows form controls. dataGridview1.DataSource = GetTransactions(currentCustomer.Id); break; } } } </code></pre> <p>The following are also useful while playing with the <code>TabControl</code>.</p> <ol> <li>TabControl.TabPages.Add();</li> <li>TabControl.TabPages.Contains();</li> <li>TabControl.TabPages.ContainsKey();</li> <li>TabControl.TabPages.Insert();</li> <li>TabControl.TabPages.Remove();</li> <li>TabControl.TabPages.RemoveAt();</li> <li>TabControl.TabPages.RemoveByKey().</li> </ol> <p>Using the <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.tabcontrol.tabpagecollection_members.aspx" rel="noreferrer"><code>TabControl.TabPageCollection Members</code></a>.</p> <p><strong>EDIT #1</strong></p> <blockquote> <p>For selecting a specific tab, it can only be identified by 0, 1, 2, and not the tab name?</p> </blockquote> <p>Yes, you might as well increment or decrement the <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.tabcontrol.selectedindex.aspx" rel="noreferrer"><code>TabControl.SelectedIndex</code></a> property to make a specific <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.tabpage.aspx" rel="noreferrer"><code>TabPage</code></a> selected/active.</p> <p>One thing though, make sure you don't index a <code>TabPage</code> out of the <code>TabPages.Count - 1</code>, since the start index is 0, otherwise you'll get an <a href="http://msdn.microsoft.com/en-us/library/system.indexoutofrangeexception.aspx" rel="noreferrer"><code>IndexOutOfRangeException</code></a> thrown.</p> <p>To continue with our example where we have two pages, the Address information and the Transactions:</p> <pre><code>// Will automatically change the selected tab to the Transactions TabPage. tabControl1.SelectedIndex = 1; // Considering there a count of two TabPages, the first is indexed at 0, and the second at 1. // Setting the SelectedIndex property to 2 will throw. tabControl1.SelectedIndex = 2; </code></pre> <p><em>Note: Any change to <code>TabControl.SelectedIndex</code> property will trigger the <code>TabControl.SelectedIndexChanged</code> event.</em></p>

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