string multiply

Thank you GSLAM
works like charm
you have been voted

Well, I am not sure of what the game is but if you wish not to have a space at the end but infront of the word, then interchange two statments..to have space first..

sb.Append(" ");
sb.Append(input);

Please mark the ans as Accepted if satisfied!

yes this is that im trying to do, like a hangman game replace the symbols with letters, and i have
done it but with no spaces left .
if someone have an idea how to insert a space please assist me
thanks!!!!!

Not sure what you are trying to acheive with the post Multiply call, but result is always 0?
Are you trying to replace the "*"'s with correctly guessed letters as in a hangman game?

well i guess i see that the multiply function is work
well but something must i have miss in this function
when i m calling

public void newword()
        {
            string charLetter = "*";
            string word="";
            int strlen = wordtoguess.Length;//wordtoguess is the letter from txt file
            string mult = Multiply(charLetter, strlen);
            word = mult;

            int result = 0;
            string newChar = "";
            for (int i = 0; i < strlen; i++)
            {
               
                newChar = wordtoguess.Substring(strlen - 1);
                word = word.Remove(strlen - 1);
                word = word.Insert(strlen - 1, newChar);
                string newChar2 = wordtoguess.Substring(result, 1);
                word = word.Remove(result, 1);
                word = word.Insert(result, newChar2);
                wordtxt.Text = word;             

            }
        }
cause  when i call the new word the letters still read the " "  symbol as char

I tried the code suggested by san K and got what you were expecting * * * * *.  I modified the code to clean up a couple of miscues:
public static void Main(string[] args)
{
 Console.WriteLine("[" + Multiply("*","hello".Length) + "]");
 Console.Write("Press any key to continue . . . ");
 Console.ReadKey(true);
}
private static string Multiply(string input, int times)
{
 StringBuilder sb = new StringBuilder((input.Length + 1) * times);  // Include the added space in the size calculation
 for (int i=0;i {
  sb.Append(input).Append(" ");
 }
 return sb.ToString().Trim();                                                             // Trim the trailing space
}

This generates [* * * * *]

I tried this portion but
----------------------------
string Multiply(string input, int times)
        {
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < times; i++)
            {
               
                sb.Append(input).Append(" ");

            }
            return sb.ToString();

        }
-------------------------------------------

nothing happened it reads hello as  * * * and not as * * * * * where each * is a letter

Then you could do this way for placing spaces in between each letter in word...

string Multiply(string input, int times)
        {
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < times; i++)
            {
               
                sb.Append(input).Append(" ");

            }
            return sb.ToString();

        }

well maybe i wasn't clear about what i was trying to achieve.
the thing i would like to achieve is to count
the word length (i read it from a txt file),
put it in a textbox and hide it with a char symbol(e.g. *)
then the user by pressing the corresponding letter
can guess the word. So if i put " " before sb read it like char (eg * * * if the word is hello cause it counts the lenght which is 5.
I want to put a blank space between these letters (eg * * * * * if the word is hello and count 5 like the string)

you can use trim function to trim the blank space on either side of the word in your string input
input.Trim();
Also, I did not understand what you are trying to achieve here...
let me know what you wanted exactly..