StackOverflow2013

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2013-05-02T21:06:00.693
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2013-05-04T11:33:58.513
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<h2>Remove Textbox if text is empty</h2> <p><strong>Update:</strong> I uploaded a <a href="https://github.com/surfmuggle/StackoverflowWinformQuestions/tree/master/DeleteTextbox" rel="nofollow">project with my code</a> from below to github. You can open my project with <a href="http://www.icsharpcode.net/OpenSource/SD/Download/" rel="nofollow">sharpdevelop</a> 4.3.</p> <p>In the Event for your Textbox you can call/fire the TextBox_LeaveEvent method:</p> <pre><code>void TextBox_LeaveEvent(object sender, EventArgs e) { var tb = sender as TextBox; // add another textbox if this tb has text if(textboxList.Count<5 && tb.Text.Length>0){ var newTextBox = getNewTextBox(textboxList.Count); textboxList.Add(newTextBox); } // remove textbox if it has no text else if(tb.Text.Length == 0){ RemoveTextBox(tb); } } </code></pre> <p>This does the following:</p> <ul> <li>if the current textbox (the sender that fired the event) has text it adds another textbox to a generic List of textboxes: <code>List<TextBox> textboxList = new List<TextBox>();</code></li> <li>if the textbox has no text (<code>tb.Text.Length == 0</code>) it is removed from the list and from the windows form by calling RemoveTextBox</li> </ul> <p>This is the method to remove a textbox</p> <pre><code>void RemoveTextBox(TextBox tb){ // this.Controls.RemoveByKey(tb.Name); int tbIndex = this.Controls.IndexOf(tb); this.Controls[tbIndex].Dispose(); textboxList.Remove(tb); } </code></pre> <p>This is the one to add the textbox dynamically to the form</p> <pre><code>TextBox getNewTextBox(int i) { var tb = new TextBox(); tb.Location = new System.Drawing.Point(220, 90 + i * 24); tb.Name = "tb_" + i.ToString(); tb.Size = new System.Drawing.Size(80,20); tb.Text = "textbox_"+i.ToString(); //String.Empty; tb.Leave += new System.EventHandler(this.TextBox_LeaveEvent); this.Controls.Add(tb); this.Refresh(); return tb; } </code></pre> <h3>Some pointers regarding your code</h3> <p>From the code example above I assume that you could change your nested <code>if () { if (){} else { if}</code> to something simpler by using <a href="http://www.dotnetperls.com/if" rel="nofollow">if() else if()</a> or by using switch (see <a href="http://msdn.microsoft.com/de-de/library/06tc147t%28v=VS.80%29.aspx" rel="nofollow">msdn</a> or <a href="http://www.dotnetperls.com/switch" rel="nofollow">dotnetperls</a>). As far i can tell from the code you gave you can probably remove a lot of code if you use a generic list of labels and textboxes. </p> <pre><code>string textBoxName = _text.Name; switch (textBoxName) { case "txtAcessorio2": c= 3; break; case "txtAcessorio3": c=4; break; default: c=0; break; } </code></pre>
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1. POAutomatically delete TextBox and label if TextBox.Text = Empty on focus leave
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1. COReally thanks for code, will try it after (i will try understand)
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