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Calculate average when checkbox are checked C# [closed]

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Good morning everyone!
So, I have 8 textboxes and under those are checkboxes. To those textboxes I'am always receiving data from a serialport and I need to do an average from those values. But I only want to do the average from the textboxes from which I checked the checkbox under them.
How can I add those values to the average formula when selected by checking the checkbox?
If anyone could help, I would really apreciate.
Thanks,
Jonathan

I think you should write something like this :
bool[] CheckBoxList { get; set; } = new bool[8];
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
CheckBoxList[0] = checkBox1.Checked;
CalcAverage();
}
private void checkBox2_CheckedChanged(object sender, EventArgs e)
{
CheckBoxList[1] = checkBox2.Checked;
CalcAverage();
}
in CalcAverage method , Textboxes with a true value in the list are computed.

C#: How can I make textarea that accepts only some specific words? [closed]

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How can I make a TextArea that accepts only the words I have already set
with C# on Visual studio.
I'm a beginner in programming.
update:
what (-3) about?
like I said I'm a beginner, trying to build android game with c#.
until now just do some mistakes.
this website little complex to handle with but I will get used to it :) and my english poor
thank you all.

Use TextBox and add TextChanged event on your tool
private void textBox1_TextChanged(object sender, EventArgs e)
{
if (!System.Text.RegularExpressions.Regex.IsMatch(textBox1.Text, "^[a-zA-Z]"))
{
MessageBox.Show("This textbox accepts only alphabetical characters");
textBox1.Text.Remove(textBox1.Text.Length - 1);
}
}
More Info
textBox1.TextChanged += new TextChangedEventHandler(textBox1_TextChanged);
private void textBox1_TextChanged(object sender, EventArgs e)
{
Regex regex = new Regex(#"[^0-9^+^\-^\/^\*^\(^\)]");
MatchCollection matches = regex.Matches(textBox1.Text);
if (matches.Count > 0) {
//tell the user
}
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
string yourWord = "mouse";
if (textBox1_Text.Text.Contains(yourWord))
{
textBox1_Text.Text.Replace(yourWord, "");
}
}

Visual effect on a mouse click in c# [closed]

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I want that if i click on an image it gives a visual effect like whirl effect or glow effect or anything else on specific part around the point where i clicked with the mouse. for example if anyone has used the picture password of UC browser of windows phone exactly the same i want.
I have not tried anything because i have no knowledge of animation and graphics hence i haven't tried anything.
public void start()
{
messagebox.show("i haven't tried anything yet no knowledge of animation");
}
This code is nothing but i wrote it because i was not able to post the question.

In Winforms you could write code like this:
int AnimationCounter = 0;
Point AnimationCenter = Point.Empty;
Timer AnimationTimer = new Timer();
private void pictureBox1 _MouseClick(object sender, MouseEventArgs e)
{
AnimationCenter = e.Location;
AnimationTimer.Interval = 20;
AnimationTimer.Start();
}
void AnimationTimer_Tick(object sender, EventArgs e)
{
if (AnimationCounter > 15)
{
AnimationTimer.Stop();
AnimationCounter = 0;
pictureBox1.Invalidate();
}
else
{
AnimationCounter += 1;
pictureBox1.Invalidate();
}
}
private void pictureBox1 _Paint(object sender, PaintEventArgs e)
{
if (AnimationCounter > 0)
{
int ac = AnimationCounter / 2;
e.Graphics.DrawEllipse(Pens.Orange, AnimationCenter.X - ac,
AnimationCenter.Y - ac, ac * 2, ac * 2);
}
}
Don't forget to hook up the Paint and MouseClick event and also the AnimationTimer_Tick event.!
The result will draw a growing circle at the spot you click on which will disappear after ca. 10 * 20 ms..
Update: The first version suffered from repeatedly hooking up the Tick event. This one is better tested ;-)

Skype Tool CheckedListbox error [closed]

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I'm coding a Skype Tool.
I'm trying to get it to be black listed so they can spam people they won't from a checked list box but I set up everything right that I know of and I receive this on skype. system.windows.forms.checkedlistbox+checkeditemcollection it spams to that instead of the selected people I've chosen? Here's the code:
private void metroButton6_Click(object sender, EventArgs e)
{
if (!string.IsNullOrEmpty(checkedListBox1.CheckedItems.ToString()) && !string.IsNullOrEmpty(metroTextBox5.Text))
{
timer3.Start();
}
}
private void timer3_Tick(object sender, EventArgs e)
{
skype.SendMessage(checkedListBox1.CheckedItems.ToString(), metroTextBox5.Text);
}
private void metroButton9_Click(object sender, EventArgs e)
{
timer3.Stop();
}

The SelectedItem of ComboBox is always a object which cannot be compared with a string. that's why you are getting such exception, so i suggest you to use:
metroComboBox1.SelectedItem.ToSting();
Hence your if will be like the following:
if (!string.IsNullOrEmpty(metroComboBox1.SelectedItem.ToString()) && !string.IsNullOrEmpty(metroTextBox1.Text))
{
// code here
}
and the sending message will be like this:
skype.SendMessage(metroComboBox1.SelectedItem.ToString, metroTextBox1.Text);

The reason for this error is metroComboBox1.SelectedItem is of type object. The method string.IsNullOrEmpty expects a string as parameter. So you can try this
if (!string.IsNullOrEmpty(metroComboBox1.SelectedItem as string) && ...
The as operator returns a string or null if metroComboBox1.SelectedItem is null or not a string.
But if SelectedItem is not a string you may rather use this:
if (!(metroComboBox1.SelectedItem == null ||
string.IsNullOrEmpty(metroComboBox1.SelectedItem.ToString())) && ...

How can i change the backcolor of picture box the number will taken from the textbox [closed]

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private PictureBox[] picturebox = new PictureBox[64];
private void button2_Click(object sender, EventArgs e)
{
int i = int.Parse(textBox1.Text);
picturebox[i].BackColor = Color.Green;
}
when the button click i will take a number between 1 to 64 from user and i will change the backcolor of the picturebox which is want by user.
for ex:
int i=3;
pictureBox3.BackColor=color.green;

Try something like this:
int i = 3;
string PB= "pictureBox" + i;
PictureBox pb= this.Controls.Find(PB, true).FirstOrDefault() as PictureBox;
pb.BackColor = Color.Green;
Here you can find this example!