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The number of times a word is repeated in the text box

How can I make the program count how often a Pre-selected word is repeated and put it in a new text box called result and this code to colors the chosen word. What should i do now?.
int index = 0;
string temp = richTextBox1.Text;
richTextBox1.Text = "";
richTextBox1.Text = temp;
while (index < richTextBox1.Text.LastIndexOf(word.Text))
{
richTextBox1.Find(word.Text, index, richTextBox1.TextLength, RichTextBoxFinds.None);
richTextBox1.SelectionBackColor = Color.Blue;
index = richTextBox1.Text.IndexOf(word.Text, index) + 1;
result.Text = //???

This might help you to set the BackColor of the words and also output the count.
int i = richTextBox1.Text.IndexOf(word.Text);
int count = 1;
while (i > -1)
{
richTextBox1.Select(i, word.Text.Length);
richTextBox1.SelectionBackColor = Color.Blue;
i = richTextBox1.Text.IndexOf(word.Text, i + 1);
result.Text = count++.ToString();
}

Limit line length in multiline textbox

I need to limit the number of characters on a single line that a user can enter into a multiline textbox. I have a function that can do that for data typed in, but not for data cut and pasted in.
I've tried reading the textbox into an array, using substring, and copying back to the text string, but this code (posted) throws an exception.
private void LongLine_TextChanged(object sender, TextChangedEventArgs e)
{
int lineCount =
((System.Windows.Controls.TextBox)sender).LineCount;
//string newText = "";
for (int i = 0; i < lineCount; i++)
{
if
(((System.Windows.Controls.TextBox)sender).GetLineLength(i) > 20)
{
string textString = ((System.Windows.Controls.TextBox)sender).Text;
string[] textArray = Regex.Split(textString, "\r\n");
textString = "";
for (int k =0; k < textArray.Length; k++)
{
String textSubstring = textArray[k].Substring(0, 20);
textString += textSubstring;
}
((System.Windows.Controls.TextBox)sender).Text = textString;
}
}
e.Handled = true;
}

This does what you seem to be asking for:
It truncates the end of any line that is longer than 20 as you type and when you paste or otherwise change the text.
private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
{
const int MAX_LINE_LENGTH = 20;
var textbox = sender as TextBox;
var exceedsLength = false;
// First test if we need to modify the text
for (int i = 0; i < textbox.LineCount; i++)
{
if (textbox.GetLineLength(i) > MAX_LINE_LENGTH)
{
exceedsLength = true;
break;
}
}
if (exceedsLength)
{
// Split the text into lines
string[] oldTextArray = textbox.Text.Split(new[] { Environment.NewLine }, StringSplitOptions.None);
var newTextLines = new List<string>(textbox.LineCount);
for (int k = 0; k < oldTextArray.Length; k++)
{
// truncate each line
newTextLines.Add(string.Concat(oldTextArray[k].Take(MAX_LINE_LENGTH)));
}
// Save the cursor position
var cursorPos = textbox.SelectionStart;
// To avoid the text change calling back into this event, detach the event while setting the Text property
textbox.TextChanged -= TextBox_TextChanged;
// Set the new text
textbox.Text = string.Join(Environment.NewLine, newTextLines);
textbox.TextChanged += TextBox_TextChanged;
// Restore the cursor position
textbox.SelectionStart = cursorPos;
// if at the end of the line, the position will advance automatically to the next line, supress that
if (textbox.SelectionStart != cursorPos)
{
textbox.SelectionStart = cursorPos - 1;
}
}
e.Handled = true;
}

Do not count the white space in the text box

I have written a program that calculates the number of characters in a word entered in the text box, but I do not want to count the number of whitespaces.
What code should I write? For example, when Max is written inside the text box, the number of letters is 3 and 3 appears in other textbox, then if whitespace is used in textbox, the number of letters remains the same as 3 and does not change.
private void textBox1_TextChanged(object sender, EventArgs e)
{
string a;
int asc , j=0;
kabir = 0;
vasit = 0;
textBox2.Text =" ";
for (int i = 0; i < textBox1.Text.Length; i++)
{
int t = abjad_kabir(Char.ConvertToUtf32(textBox1.Text.Substring(i, 1), 0));
textBox2.Text = Convert.ToString(t);
j++;
// I want to do not appear number of white spaces in textbox3 and just count number of letters
textBox3.Text = Convert.ToString(j);
}
}

Remove all the characters that you don't want with a regular expression and count the remaining characters:
var text = "Max Length";
Console.WriteLine("Length={0}", Regex.Replace(text, #"\W+", "").Length);

You could also use Linq for this:
var count = text.Count(c => c != ' ');

I could delete white spaces by Trim() method.
private void textBox1_TextChanged(object sender, EventArgs e)
{
string a;
int asc, j = 0;
kabir = 0;
vasit = 0;
textBox2.Text = " ";
string s, m;
for (int i = 0; i < textBox1.Text.Length; i++)
{
int p = Char.ConvertToUtf32(textBox1.Text.Substring(i, 1), 0);
int t = abjad_kabir(p);
textBox2.Text = Convert.ToString(t);
s = textBox1.Text;
m = s.Trim();
textBox3.Text = Convert.ToString(m.Length);
}
}

Counting the number of highlighted words in richtextbox using c#

private void button2_Click(object sender, EventArgs e)
{
string[] show = richTextBox1.Text.Split(' ');
string type = textBox1.Text;
for (int i = 0; i < show.Length; i++)
{
int num = 0;
if (show[i] == textBox1.Text)
num++;
}
Label1.Text = num.ToString();
}
Im using richTextBox1 to display the file and the textBox1 to search for a word and highlight it. I want to display how many words are highlighted in the label box but it always shows zero. Any help is appreciated.

You should move int num = 0; out of your loop, since in each iteration it will be set to 0;

You need to consider the new line character condition.
In my example, I remove Chr(13) and replace Chr(10) with a space, so it behaves the same way as a space character:
string[] show = richTextBox1.Text.Replace(Convert.ToChar(13).ToString(), " ").Replace(Convert.ToChar(10).ToString(), " ").Split(' ');
string type = textBox1.Text;
int num = 0;
for (int i = 0; i < show.Length; i++)
{
if (show[i].Trim() == textBox1.Text)
num++;
}
textBox1.Text = num.ToString();

Split the content of textbox into respective individual textboxes at run time in c#?

I want the text contents of a TextBox to split into respective individual Textbox carrying a single character using c# windows application form.
Eg : A single Textbox containing text as-[Orange]
Expected output:-
in 20 separate textboxes
[o][r][a][n][g][e][][][][][][][][][][][][][][]
Till now I have done this..
`string name = textBox1.Text;
string str = name;
int chunkSize = 1;
Int32 stringLength = str.Length;
for (int i = 0; i < stringLength; i += chunkSize)
{
TextBox txtbox = new TextBox();
//if (i + chunkSize > stringLength)
//chunkSize = stringLength - i;
string singlechar = str.Substring(i, chunkSize);
txtbox.TextAlign = HorizontalAlignment.Center;
txtbox.BorderStyle = BorderStyle.FixedSingle;
txtbox.Font = new Font(txtbox.Font, FontStyle.Bold);
txtbox.Text = singlechar;
//txtbox.MaxLength = 1;
int a = 30;
int x = (i + 10) * a;
txtbox.Text = txtbox.Text.ToUpper();
txtbox.Location = new System.Drawing.Point(x, 100);
txtbox.BackColor = Color.White;
txtbox.Size = new System.Drawing.Size(30, 20);
this.Controls.Add(txtbox);
}`

I think you want this:-
textBox1 = mainTextBox.Text[0] ;
textBox2 = mainTextBox.Text[1] ;
// and so on..

assuming other TextBoxs in Panel named panel1 you can write something like :
for (int i = 0; i < textBox1.Text.Length; i++)
((TextBox)panel1.Controls[i]).Text = textBox1.Text[i].ToString();