Develop Reference

TextBox.Text without the suffix of the appended part of Autocomplete

Is there a way to get the Text in a TextBox that has an Autocomplete that appends text, but without the part that is appended? I want to use this text in the Textbox_TextChanged-event. This code doesn't work
private void Textbox_TextChanged(object sender, EventArgs e)
{
var t = textbox.Text.Substring(0, textbox.SelectionStart);
}
It seems the TextChanged-event fires when the autocomplete-text is appended, but the selection of the appended text is applied after that.
E.g. if the user types in ho and the autocomplete has an entry house, the textbox contains the text house, but the use is selected and can be overwritten when the user continues typing. I want to get the ho-part, because that is the text the user has typed in, without the use-part, which doesn't come from the user.

Question is some what confusing, I have provide an answer as I understood it.
Text change event fires when you change text in the textbox. You can use suggest instead of appending it
Assume that textbox name is "Textbox1"
private void Textbox1_TextChanged(object sender, EventArgs e)
{
this.Textbox1.AutoCompleteMode =
System.Windows.Forms.AutoCompleteMode.Suggest;
var t = Textbox1.Text;
}

I solved it with a delay, so the textbox has time to apply the selection. This seems to work so far, but could be an issue if the applying of the selection takes longer than the wait-time.
private async void Textbox_TextChanged(object sender, EventArgs e)
{
await Task.Delay(200);
var t = textbox.Text.Substring(0, textbox.SelectionStart);
}

How to change text of Label while typing in TextBox

Please I'm new to C#, I created a textBox and a label. What i am expecting is, if I type a value into the textBox, I want it to display on the label and if I change the value it should also change immediately on the label.
it work with the code below and i press enter key
private void textBox1_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
label1.Text = textBox1.Text;
}
}
But I want it without press Enter/Return Key on keyboard.
Thanks for understanding

This works for VisualStudio
Select your TextBox in the Designer, go to the it's properties and click on the events (teh icon with the lightning). Then make a double click on the event that is called: TextChanged.
This creates a new function, that will always be called when the text of your TextBox changes. Insert following code into the function:
private void textBox1_TextChanged(object sender, EventArgs e)
{
TextBox tb = sender as TextBox;
label1.Text = tb.Text;
}
That's it.

label.DataBindings.Add("Text", textBox, "Text");

textbox KeyDown/Up/Press events may help.
For example
private void textBox1_KeyDown(object sender, KeyEventArgs e)
{
label1.Text += e.KeyData.ToString();
}

How to pass data from a textbox to a label in the same webform in c#?

I just need to do what the user types into a textbox repeat a label in c # on the same webform

Use the Text property of the label to set the text of the label, based on what is in textBox1 at the point in time when the TextChanged event fires. You should be able to access the controls in the code behind.The general form is
private void textBox1_TextChanged(object sender, EventArgs e)
{
Label1.Text = textBox1.Text;
}

Try
get the textbox's text to a string and then set the string to the label
string text=textbox1.Text;
label1.Text=text;
or
label1.Text=textbox1.Text; // in a single line
it can be put inside a button click
private void button1_Click(object sender, EventArgs e)
{
Label1.Text = textBox1.Text;
}

Simultaneously update two textbox in C#

When I insert data in textbox1, I need that in textbox2 is placed same data simultaneously.
I dont know which event permits this feature. Im using visual studio 2010.
thanks in advance!

Use the TextChanged event on textbox1 and use it to update textbox2:
// This can be done via designer too.
this.textbox1.TextChanged += new EventHandler(textbox1_TextChanged);
Now, in your form class:
void textBox1_TextChanged(object sender, EventArgs e)
{
textbox2.Text = textbox1.Text;
}
Hope this helps.

Add this handler to the TextChanged event of textBox1:
private void OnTextChanged(object sender, EventArgs e)
{
var textBox = sender as TextBox;
textBox2.Text = textBox.Text;
}

Dropped down in combo after focused

I have a combo box. It must display its content, when focused and its value changed as well.
I wrote this code in its Value Change event:
if(combo1.Focused)
combo1.DroppedDown=true;
But it doesn't work!
what's your solution?

What Event handler are you putting that code in? Assuming that you want to show the drop down when the user types in the edit box part of the combo just handle the TextChanged event and put that code inside there and it should work.

If I understand your requirement correctly, when the combobox gets focus you want the drop down list to show. That can be achieved as follows
private void Form1_Load(object sender, EventArgs e)
{
comboBox1.GotFocus += new EventHandler(comboBox1_GotFocus);
}
void comboBox1_GotFocus(object sender, EventArgs e)
{
comboBox1.DroppedDown = true;
}