Develop Reference

C# Listboxes using selectedvaluechanged

I usually figure things out but this has me beat.
I have an array of listboxes on a form and a submit button. The user can pick items from any listbox then click the submit button to choose the confirm the item, but what needs to happen is that if they select something from listbox 1 then change their mind and select something from listbox 2, the item selected in listbox 1 should become unselected.
I can code that in to the eventhandlers but the problem is as soon as I change a value in another listbox programatically it fires another event. I can't seem to logic my way out of it.
Any ideas would be great otherwise I guess I will just have to put multiple submit buttons.
EDIT:
I figured out what I think is quite an obvious and simple solution in the end. I made use of the focused property to distinguish whether the user or the program was making changes. Works for both mouse and keyboard selections.
Thanks for the suggestions...
for (int i = 0; i < treatments.Length; i = i + 1)
{
this.Controls.Add(ListBoxes[i]);
this.Controls.Add(Labels[i]);
this.Controls.Add(Spinners[i]);
Labels[i].Top = vPosition - 20;
Labels[i].Left = hPosition;
Labels[i].Width = 600;
ListBoxes[i].Left = hPosition;
ListBoxes[i].Top = vPosition;
ListBoxes[i].Width = 600;
Spinners[i].Top = vPosition + ListBoxes[i].Height;
Spinners[i].Left = hPosition + ListBoxes[i].Width - 60;
Spinners[i].Width = 40;
for (int d = 25; d > 0; d = d - 1) { Spinners[i].Items.Add((d).ToString()); }
Spinners[i].SelectedIndex = 24;
//EVENT HANDLER CODE that is executed if any selectetindexchange in any LIstbox in array
ListBoxes[i].SelectedIndexChanged += (sender, e) =>
{
for (int s = 0; s < i; s = s + 1)
{
//FIND WHICH LBs[s] IS THE SENDING LISTBOX
if (ListBoxes[s] == sender && ListBoxes[s].Focused == true)
{
string msg = "sender is ListBox " + s.ToString() + "\nFocus is" + ListBoxes[s].Focused.ToString();
// MessageBox.Show(msg);
}
else if(ListBoxes[s].Focused==false)
{
ListBoxes[s].SelectedIndex = -1;
}
}
}; //end of event handler
}

I generally solve this kind of problem with a flag that lets me know that I am changing things, so my event handlers can check the flag and not take action in that case.
private int codeChangingCount = 0;
private void combobox1_SelectedIndexChanged(object sender, EventArgs e) {
codeChangingCount++;
try {
combobox2.SelectedIndex = someNewValue;
} finally {
codeChangingCount--;
}
}
private void combobox2_SelectedIndexChanged(object sender, EventArgs e) {
if (codeChangingCount == 0) {
//I know this is changing because of the user did something, not my code above
}
}
You can do this with a simple bool instead of an int, but I like the counter approach so that I can keep incrementing codeChangingCount in nested calls and not accidentally reset it. In my production code, I have a class dedicated to this kind of flagging, and it (mis)uses IDisposable to decrement, so I can just wrap my calls in a using block, but the above snippet is simpler for illustration.

Check if Focused ListBox == ListBox2 and SelectedIndex > -1 then deselect Index[0]
if (ListBoxes[s] == sender && ListBoxes[s].Focused == true)
{
if(s == 1 && ListBoxes[s].SelectedIndex > -1) //assuming 1 is listbox2
{
ListBoxes[0].SelectedIndex = -1; // Deselect ListBox1
}
string msg = "sender is ListBox " + s.ToString() + "\nFocus is" + ListBoxes[s].Focused.ToString();
}

How to fetch data from dynamically created textboxes (windows application)

I have used the below code to dynamically create textboxes by giving the total number of textboxes initially. After i enter values to these textboxes, how can i fetch the values from it. Like if i give count as 3, 3 textboxes will be created. Now, i enter data to each textbox. How can i read the values i entered into these texboxes.
int a = 1;
public Form1()
{
InitializeComponent();
}
public System.Windows.Forms.TextBox AddNewTextBox()
{
System.Windows.Forms.TextBox txt = new System.Windows.Forms.TextBox();
this.Controls.Add(txt);
txt.Top = a * 25;
txt.Left = 100;
txt.Name = "txt" + this.a.ToString();
txt.Text = "TextBox " + this.a.ToString();
a = a + 1;
return txt;
}
private void button1_Click(object sender, EventArgs e)
{
int i;
int count = Int16.Parse(counttxt.Text.ToString());
for (i = 1; i <= count; i++)
{
AddNewTextBox();
}
}

Hold a reference to the dynamically generated TextBox in a variable of type array or list.
Beside that if u want the value from TextBox that was named txt1
string value = this.Controls["txt1"].Text

string allTextBoxValues = "";
foreach (Control childc in Controls) {
if (childc is TextBox && childc.Name.Contains("txt"))
allTextBoxValues += ((TextBox)childc).Text + ",";
}

How to get array data from one Click Method to another one

Don't think i could be any newer to coding, so please forgive me for whats about to be asked.
Im currently writing a program that lets the user enter a desired amount of random numbers to be generated by Random via textBox (lets say 15 --> you get 15 random numbers), ranging from 1 to 1000.
When hitting the Button A, those randomized Numbers will be saved in Zahlenarray[](-->with the length of the number entered in the textbox) and displayed in label1.Text.
Then there's a Button B, that, when clicked, should sort the Numbers from Zahlenarray[] via bubblesort and display them in label2.
My problem is now that the second Method (Button B_Click) doesnt have the contents of Zahlenarray from the Button A_Click Method.
Id like to pass this data by ref via the arguments, but fiddling with public void (Object sender, EventArgs e) seems to get me in major trouble.
Can i add arguments after EventArgs e, ... or am i missing another way of getting data out f this "scope" (hope thats the right word)?
Both Methods are in the same class.
part of the code of Button A:
public void Button_Anzeigen_Click(Object sender, EventArgs e)
{
label1.Text = "";
int[] Zahlenarray = new int[Int32.Parse(textBox1.Text)];
Everything from Button B:
private void Button_Sortieren_Click(object sender, EventArgs e)
{
label2.Text = "";
label3.Text = "";
int Speicher;
for (int n = Zahlenarray.Length; n > 0; n--)
{
for (int i = 0; i < n-1; i++)
{
if (Zahlenarray[i] > Zahlenarray[i + 1])
{
Speicher = Zahlenarray[i];
Zahlenarray[i] = Zahlenarray[i + 1];
Zahlenarray[i + 1] = Speicher;
Speicher = 0;
}
}
}
foreach (int i in Zahlenarray)
{
label2.Text += i + " ";
if ((i % 9 == 0) && !(i == 0))
label2.Text += "\n";
}
}

Put your array declaration outside of your buttona click handler so you can reference it inside your button b handler.
int[] Zahlenarray;
public void Button_Anzeigen_Click(Object sender, EventArgs e)
{
label1.Text = "";
Zahlenarray = new int[Int32.Parse(textBox1.Text)];
...
}

Replace string one by one at run-time in datagridview c#

I have managed to replace all the strings in the datagridview at run-time.Now i want to replace the string one by one on the click of the button.This is the code for the replacement of all the strings on a single button click.
private void button9_Click_1(object sender, EventArgs e)
{
var original = ((DataTable)dataGridView1.DataSource);
var clone = original.Clone();
var ordinal = original.Columns["Stringtext"].Ordinal;
var tra = original.Columns[6].Ordinal;
var che = original.Columns[10].Ordinal;
for (int i = 0; i < original.Rows.Count; i++)
{
var values = original.Rows[i].ItemArray;
if (Convert.ToBoolean(values[tra].ToString()) && Convert.ToBoolean(values[che].ToString()))
{
values[ordinal] = ((values[ordinal].ToString()).ToLower())
.Replace(textBox6.Text.ToLower(), textBox7.Text);
clone.Rows.Add(values);
}
else
{
values[ordinal] = values[ordinal];
clone.Rows.Add(values);
}
}
dataGridView1.DataSource = clone;
string filterBy;
filterBy = "Stringtext Like '%" + textBox7.Text + "%'";
((DataTable)dataGridView1.DataSource).DefaultView.RowFilter = filterBy;
}
I want to replace a single string in a row on the click of a button then on the next button click the next string in the row is replaced.etc.any ideas?

the easy way to do what you want is to keep a counter on how many times did the user pressed the button. that way you can tell this is the 1st, 2end or 3rd time the user clicked the button and by so replace the needed cell
private int counter = 0;
private void button1_Click(object sender, EventArgs e)
{
// change the cell = counter
counter++;
}

C# form - Checkboxes

I'm wondering how to restrict my checkbox from adding to my listbox. At the moment when the user checks the checkbox it will add "Anchovies" to the listbox. What I don't want to happen is when the user deselects the checkbox and re selects it again, "Anchovies" is added to the listbox again (showing two lots of "Anchovies").
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
if (checkBox1.Checked)
{
listBox1.Items.Add("Anchovies");
double total = Convert.ToDouble(textBox2.Text);
total = total + .5;
textBox2.Text = Convert.ToString(total);
}
}

The key is to check if Anchovies already exists on the listBox1 items.
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
if (checkBox1.Checked)
{
//If the item is already there, we don't do anything.
if (!listBox1.Items.Contains("Anchovies")) {
listBox1.Items.Add("Anchovies");
double total = Convert.ToDouble(textBox2.Text);
total = total + .5;
textBox2.Text = Convert.ToString(total);
}
}
}

Do it this way
if (checkBox1.Checked)
{
if(!listBox1.Items.Contains("Anchovies"))
listBox1.Items.Add("Anchovies");
double total = Convert.ToDouble(textBox2.Text);
total = total + .5;
textBox2.Text = Convert.ToString(total);
}

To fix this issue, you need to check your list box(for this value, either it is already there or not) before inserting any value in it.
e.g
foreach (var item in listBox1.Items )
{
if(item.ToString() != "Anchovies")
{
listBox1.Items.Add("Anchovies");
}
// other code here.
}