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    <p>As the OP insists on the use of <code>String.Format</code>:</p> <pre><code>string input; //the input of your textbox int temp = int.Parse(input); //parse your input into an int //the Format() adds the decimal points, the replace replaces them with the / string output = String.Format("{0:0,0}", temp).Replace('.', '/'); </code></pre> <p>The important step here is to cast the text of your textbox into an integer, as this simplifies the insertion of the decimal points with <code>String.Format()</code>. Of course, you have to make sure that your textbox is a valid number upon parsing or you may get an exception.</p> <hr> <p><strong>EDIT</strong></p> <p>So... you have some <em>dynamic-length</em> number and want to format it using a <em>static</em> format-string (as regexes, string replaces, ling or any c# code at all (!) are a no go)? This is impossible. You HAVE TO have some dynamic code creating a format string somewhere.<br> Without referencing to regexes or string replaces again, here is some code to create a format string depending on your input number.<br> This way you have just one <code>String.Format()</code> call. Perhaps you can put the algorithm to create the format string somewhere else and just call it from whereever you need it.</p> <pre><code>string input; //the input of your textbox int temp = int.Parse(input); //parse your input into an int string customString = "{0:"; string tempS = ""; for (int i = 0; i &lt; input.Length; i++) { if (i % 3 == 0 &amp;&amp; i != 0) { tempS += "/"; } tempS += "#"; } tempS = new string(tempS.Reverse().ToArray()); customString += tempS; customString += "}"; string output = String.Format(customString, temp)); </code></pre>
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    1. COsee my update please
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    2. CO@MamadR updated my answer
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    3. COthanks this answer is not that i exact want but better than other :) thx again
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