Develop Reference

how can use sender and tags together in c#?

I want develop a calculator by using c#, and I do not use method click for all button from 0 to 9 I want I have just one method and if I click the each button wrote in textbox by using sender and tags.
best regards
enter code here
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Final
{
public partial class Form1 : Form
{
bool names;
int counter;
string name;
double ans, num;
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
Environment.Exit(0);
}
private void button6_Click(object sender, EventArgs e)
{
textBox1.Text += "1";
counter++;
again();
}
private void button7_Click(object sender, EventArgs e)
{
textBox1.Text += "2";
counter++;
again();
}
private void button8_Click(object sender, EventArgs e)
{
textBox1.Text += "3";
counter++;
again();
}

You can have just one handler for all digit buttons, and then you can extract its value like this:
int num = int.Parse(((Button)sender).Text);
This assumes that you set the Text property of the buttons to: 0,1,2..9
You can access the Tag property just like the Text:
var txt = ((Button)sender).Tag).ToString();
textBox1.Text += txt;

Set .Tag to correspondent value and then retrieve it from sender by casting it to Button type.
private void button_Click(object sender, EventArgs e)
{
var button = (Button)sender;
textBox1.Text += button.Tag.ToString();
counter++;
again();
}
public Form1()
{
InitializeComponent();
button1.Tag = 1;
button1.Click += button_Click;
button2.Tag = 2;
button2.Click += button_Click;
// and so on for other buttons
}

C# Checking if button was clicked

I am making a program that should just continue if 2 conditions are given.
The first one, 2 TextBoxs have the same word in and a Button was clicked, which opens a new Form. Now I have the event for the "complete" button.
private void button2_Click(object sender, EventArgs e)
{
if (textBox2.Text == textBox3.Text && ???)
{
StreamWriter myWriter = File.CreateText(#"c:\Program Files\text.txt");
myWriter.WriteLine(textBox1.Text);
myWriter.WriteLine(textBox2.Text);
}
]
My problem is, I can't find a method that gives something like `button1.Clicked or something similar.
I hope someone can help me here..

Click is an event that fires immediately after you release the mouse button. So if you want to check in the handler for button2.Click if button1 was clicked before, all you could do is have a handler for button1.Click which sets a bool flag of your own making to true.
private bool button1WasClicked = false;
private void button1_Click(object sender, EventArgs e)
{
button1WasClicked = true;
}
private void button2_Click(object sender, EventArgs e)
{
if (textBox2.Text == textBox3.Text && button1WasClicked)
{
StreamWriter myWriter = File.CreateText(#"c:\Program Files\text.txt");
myWriter.WriteLine(textBox1.Text);
myWriter.WriteLine(textBox2.Text);
button1WasClicked = false;
}
}

These helped me a lot: I wanted to save values from my gridview, and it was reloading my gridview /overriding my new values, as i have IsPostBack inside my PageLoad.
if (HttpContext.Current.Request["MYCLICKEDBUTTONID"] == null)
{
//Do not reload the gridview.
}
else
{
reload my gridview.
}
SOURCE: http://bytes.com/topic/asp-net/answers/312809-please-help-how-identify-button-clicked

button1, button2 and button3 have same even handler
private void button1_Click(Object sender, EventArgs e)
{
Button btnSender = (Button)sender;
if (btnSender == button1 || btnSender == button2)
{
//some code here
}
else if (btnSender == button3)
//some code here
}

i am very new to this website. I am an undergraduate student, doing my Bachelor Of Computer Application.
I am doing a simple program in Visual Studio using C# and I came across the same problem, how to check whether a button is clicked?
I wanted to do this,
if(-button1 is clicked-) then
{
this should happen;
}
if(-button2 is clicked-) then
{
this should happen;
}
I didn't know what to do, so I tried searching for the solution in the internet. I got many solutions which didn't help me. So, I tried something on my own and did this,
int i;
private void button1_Click(object sender, EventArgs e)
{
i = 1;
label3.Text = "Principle";
label4.Text = "Rate";
label5.Text = "Time";
label6.Text = "Simple Interest";
}
private void button2_Click(object sender, EventArgs e)
{
i = 2;
label3.Text = "SI";
label4.Text = "Rate";
label5.Text = "Time";
label6.Text = "Principle";
}
private void button5_Click(object sender, EventArgs e)
{
try
{
if (i == 1)
{
si = (Convert.ToInt32(textBox1.Text) * Convert.ToInt32(textBox2.Text) * Convert.ToInt32(textBox3.Text)) / 100;
textBox4.Text = Convert.ToString(si);
}
if (i == 2)
{
p = (Convert.ToInt32(textBox1.Text) * 100) / (Convert.ToInt32(textBox2.Text) * Convert.ToInt32(textBox3.Text));
textBox4.Text = Convert.ToString(p);
}
I declared a variable "i" and assigned it with different values in different buttons and checked the value of i in the if function.
It worked. Give your suggestions if any. Thank you.

How can i check for text identical in textBox while typing inside the textBox?

I have this Form:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace GatherLinks
{
public partial class ChangeLink : Form
{
public ChangeLink()
{
InitializeComponent();
}
public string getText()
{
return textBox1.Text;
}
private void button1_Click(object sender, EventArgs e)
{
if (!string.IsNullOrEmpty(textBox1.Text))
{
DialogResult = DialogResult.OK;
}
else
{
}
}
private void ChangeLink_Load(object sender, EventArgs e)
{
this.AcceptButton = button1;
}
}
}
And this code in Form1:
public void KeysValuesUpdate()
{
DialogResult dr = DialogResult.None;
using (var w = new StreamWriter(keywords_path_file))
{
crawlLocaly1 = new CrawlLocaly(this);
crawlLocaly1.StartPosition = FormStartPosition.CenterParent;
if (FormIsClosing != true)
{
dr = crawlLocaly1.ShowDialog(this);
}
if (dr == DialogResult.OK)
{
if (LocalyKeyWords.ContainsKey(mainUrl))
{
LocalyKeyWords[mainUrl].Clear();
LocalyKeyWords[mainUrl].Add(crawlLocaly1.getText());
}
else
{
LocalyKeyWords[mainUrl] = new List<string>();
LocalyKeyWords[mainUrl].Add(crawlLocaly1.getText());
}
Write(w);
ClearListBox();
}
if (dr == DialogResult.Cancel)
{
Write(w);
}
if (dr == DialogResult.None)
{
Write(w);
}
}
}
This KeysValuesUpdate() function is called here:
private void button2_Click(object sender, EventArgs e)
{
cl = new ChangeLink();
cl.StartPosition = FormStartPosition.CenterParent;
DialogResult dr = cl.ShowDialog(this);
if (dr == DialogResult.Cancel)
{
cl.Close();
}
else if (dr == DialogResult.OK)
{
label4.Text = cl.getText();
mainUrl = cl.getText();
if (!LocalyKeyWords.ContainsKey(mainUrl))
{
newUrl = true;
KeysValuesUpdate();
}
else
{
newUrl = false;
KeysValuesUpdate();
}
OptionsDB.set_changeWebSite(cl.getText());
cl.Close();
listBox1.SelectedIndex = listBox1.Items.Count - 1;
}
}
When I click the button2 it's opening the new Form with a textbox and then inside I can type text.
Then I checking if the text inside already exist then newUrl is false or true.
Then when I click OK the OK button in the new Form then it's checking if the text I typed Contain/exist already or not.
I want that when the user type something in the textbox while he is typing if it's Contain/Exist the key then color the text in the textbox in Red one the user is keep typing and the text is not Contain/EXist color it back to Black but each time if the text in the textbox Contain/Exist already color it in Red and only if it's match case not if the text is inside other text:
This is in black:
For example : Danny hello all
But if I type in the textbox only: hello
Then the word hello will be in Red then if I kept typing after the hello then all the text in the textbox is Black if I delete the text and kept only the word hello then it will be Red again.
And that should be according to the code above and in realtime when im typing text in the textbox.
The new Form again with updated code with the textBox1 text changed event:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace GatherLinks
{
public partial class ChangeLink : Form
{
Form1 f1;
public ChangeLink(Form1 f)
{
InitializeComponent();
f1 = f;
}
public string getText()
{
return textBox1.Text;
}
private void button1_Click(object sender, EventArgs e)
{
if (!string.IsNullOrEmpty(textBox1.Text))
{
DialogResult = DialogResult.OK;
}
else
{
}
}
private void ChangeLink_Load(object sender, EventArgs e)
{
this.AcceptButton = button1;
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
if (f1.mainUrl.Contains(textBox1.Text))
{
textBox1.ForeColor = Color.Red;
}
else
textBox1.ForeColor = Color.Black;
}
}
}

private void textBox_TextChanged(object sender, EventArgs e)
{
if (Regex.IsMatch(yourtext, #"\b" + textBox.Text + #"\b"))
{
textBox.ForeColor = Color.Red;
}
else
textBox.ForeColor = Color.Black;
}
Place your data containing variable name at the place of yourtext.
I have edited the answer. It is perfectly matching the whole words as you asked to do. To use Regex class, include System.Text.RegularExpressions namesapce.

You can implement textBox1 TextChanged event handler simply by defining a method
private void textBox1_TextChanged(object sender, EventArgs e)
{
var textBox = sender as TextBox;
String text = textBox.Text;
if (SomeCheck(text))
{
textBox.ForeColor = Color.Red;
}
else
{
textBox.ForeColor = Color.Black;
}
}
and assigning method textBox1_TextChanged to OnTextChanged property of textBox

How do I prepend text from one textbox to another?

Basically I'm making a simple program to help take notes at my job. I have a one line textbox1, and a multiple line textbox2.
I want to be able to type whatever in textbox1, and then press "enter" and it show up in the first line in textbox2. Any help would be appreciated.
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void textbox1_TextChanged(object sender, EventArgs e)
{
}
private void textBox2_TextChanged(object sender, EventArgs e)
{
}
}

//in form constructor, or InitializeComponent method
textBox1.Validated += DoValidateTextBox;
//in another place of your class
private void DoValidateTextBox(object sender, EvenArgs e) {
textBox2.Text = ((TextBox)sender).Text + Environment.NewLine + textBox2.Text;
}

This should work:
private void textBox1_KeyDown(object sender, KeyEventArgs e) // Keydown event in Textbox1
{
if (e.KeyCode == Keys.Enter) // Add text to TextBox2 on press Enter
{
textBox2.Text += textBox1.Text;
textBox2.Text+= "\r\n"; // Add newline
textBox1.Text = string.Empty; // Empty Textbox1
textBox1.Focus(); // Set focus on Textbox1
}
}
If you want to add text at the firstline of your textbox, then replace in the code above:
textBox2.Text = textBox1.Text + "\r\n" + textBox2.Text;

It depends on what you want the final result to be. If all you want is the first line of the second textbox to equal the first then:
void myEvent()
{
textbox2.Text = textbox1.Text;
}
If however you want whatever is in textbox1 to be appended to textbox2 every time you press a button, then you are better off using a ListView:
void myEvent()
{
myListView.Items.add(textbox1.Text);
}
If you specifically want a textbox though (with the data always appended to the first line):
void myEvent()
{
textbox2.Text = textbox1.Text + Environment.NewLine + textbox2.Text;
}

Decimal point in calculator c#

AHHHHH ok this is driving me nuts.
Why when does my decimal point in the wrong place e.g.
if i have the string 567 in the textbox and click the decimal button i would expect (or i want) the textbox to change to 567. but instead i get .567
It only goes into the correct place when i add another number e.g. if i had the number 4 then straight after doing the above I'd get 567.4
Edit:
Heres my whole code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
namespace Calculator
{
public partial class frmCurrencyCalc : Form
{
public frmCurrencyCalc()
{
InitializeComponent();
}
private void cmdZero_Click(object sender, EventArgs e)
{
if (txtScreen.Text == "0")
{
txtScreen.Text = "0";
}
else
{
txtScreen.AppendText("0");
}
}
private void cmd1_Click(object sender, EventArgs e)
{
if (txtScreen.Text == "0")
{
txtScreen.Text = "1";
}
else
{
txtScreen.AppendText("1");
}
}
private void cmdTwo_Click(object sender, EventArgs e)
{
if (txtScreen.Text == "0")
{
txtScreen.Text = "2";
}
else
{
txtScreen.AppendText("2");
}
}
private void cmdThree_Click(object sender, EventArgs e)
{
if (txtScreen.Text == "0")
{
txtScreen.Text = "3";
}
else
{
txtScreen.AppendText("3");
}
}
private void cmdFour_Click(object sender, EventArgs e)
{
if (txtScreen.Text == "0")
{
txtScreen.Text = "4";
}
else
{
txtScreen.AppendText("4");
}
}
private void cmdFive_Click(object sender, EventArgs e)
{
if (txtScreen.Text == "0")
{
txtScreen.Text = "5";
}
else
{
txtScreen.AppendText("5");
}
}
private void cmdSix_Click(object sender, EventArgs e)
{
if (txtScreen.Text == "0")
{
txtScreen.Text = "6";
}
else
{
txtScreen.AppendText("6");
}
}
private void cmdSeven_Click(object sender, EventArgs e)
{
if (txtScreen.Text == "0")
{
txtScreen.Text = "7";
}
else
{
txtScreen.AppendText("7");
}
}
private void cmdEight_Click(object sender, EventArgs e)
{
if (txtScreen.Text == "0")
{
txtScreen.Text = "8";
}
else
{
txtScreen.AppendText("8");
}
}
private void cmdNine_Click(object sender, EventArgs e)
{
if (txtScreen.Text == "0")
{
txtScreen.Text = "9";
}
else
{
txtScreen.AppendText("9");
}
}
private void cmdDecimal_Click(object sender, EventArgs e)
{
txtScreen.AppendText(".");
cmdDecimal.Enabled = false;
}
private void cmdCancel_Click(object sender, EventArgs e)
{
txtScreen.Text = "0";
cmdDecimal.Enabled = true;
}
}
}

The RightToLeft looks to be your problem.
As described in MSDN,
The RightToLeft property is used for
international applications where the
language is written from right to
left, such as Hebrew or Arabic. When
this property is set to
RightToLeft..::.Yes, control elements
that include text are displayed from
right to left.
As one ofthe previous answers suggested, this should be set to false, but with TextAlign set to Right to mimic the appearance of a real calculator.

My advice is -- define a business layer. In your case -- a double variable. Upon button clicks, update the variable first. Then format the value.

My advice is to set TextAlign to Right, but leave RightToLeft set to No.
Edit: Having said that, this issue may be unrelated to these settings.
I remember a friend having this a bug similar to this back in early 2009 in Visual Studio 2008 on Windows Vista. Strangely enough, the same problem did not occur on the same version of Visual Studio on Windows XP.
If you haven't updated Visual Studio / .NET 3.5 to Service Pack 1, I suggest doing that and seeing if it fixes the problem.

Perhaps try a different method:
private void AddDecimal()
{
txtScreen.SelectionLength = txtScreen.TextLength;
txtScreen.SelectedText += ".";
}
(Also is your text box, text aligment, right aligned... if not that may contribute to your problem.)

I think you have a few things here.
By the looks of it, you've set:
txtScreen.right to left = true;
If you append just the decimal point, you get the result you describe. Try using something like:
txtScreen.AppendText(".00");
This will give you the result you are describing.
You could be opening a can of worms. When you start formatting the textbox, you are changing it from holding a value to presentation. Eg:
decimal value = 567;
txtScreen.Text = value.ToString("0.00");
Then you will have to start writing crazy validation rules to avoid values like 567.00.1 etc.

Just to let you all know who are interested.
I managed to fix it somehow. All I did was delete the right to left thing in the design code and then realigned it (using the GUI) to right and its worked...odd as I did nothing different to last time...
Oh well
Thank you all for your help
Much aprreciated
x

You can try this one, it works for me:
private void btndot_Click(object sender, EventArgs e)
{
if (txtbox.Text == "0" && txtbox.Text != null)
{
txtbox.Text = ".";
}
else
{
txtbox.Text = txtbox.Text + ".";
}
}