Odtnhj

I am trying to create a multiplication table.

This is what I have to create:

This is what i currently have:

My code (for the while button):

private void button1_Click(object sender, EventArgs e)

 int i = 0;
 string s = " ";
 int m = int.Parse(textBox4.Text);
 while (i <= 10)
 
 s = s + "n" + m + " * " + i + " = " + m * i + "n";
 i++;
 
 textBox1.Text = s;
 label2.Text = "Timetable created with <<while>>";

Obviously the issue is with the String = s - but I just cannot figure it out!

In Windows you should use rn to move caret to new line. It's stored in Environment.NewLine.
Change

s = s + "n" + m + " * " + i + " = " + m * i + "n";

to

s = s + "n" + m + " * " + i + " = " + m * i + Environment.NewLine;

BTW: try to look to ListView control, looks like it's more relevant to your task.

Since you are appending multiple strings in a loop, you better use StringBuilder:

var sb = new StringBuilder();
while (i <= 10)

 sb.Append(m)
 .Append(" * ")
 .Append(i)
 .Append(" = ")
 .AppendLine(m * i); // AppendLine will append the line break for you after the value
 i++;

textBox1.Text = sb.ToString()

This has to do with the fact that a string is immutable, and therefor for every append you are actually creating a new string in memory - while a StringBuilder is using an internal buffer (probably an array of chars) to build the string part after part and has a much better performance.