How to Format String to Money

you will need to convert it to a decimal first, then format it with money format.

EX:

decimal decimalMoneyValue = 1921.39m;
string formattedMoneyValue = String.Format("{0:C}", decimalMoneyValue);

a working example:

decimal value = 0.00M;
value = Convert.ToDecimal(12345.12345);
Console.WriteLine(value.ToString("C"));
//OutPut : $12345.12
Console.WriteLine(value.ToString("C1"));
//OutPut : $12345.1
Console.WriteLine(value.ToString("C2"));
//OutPut : $12345.12
Console.WriteLine(value.ToString("C3"));
//OutPut : $12345.123
Console.WriteLine(value.ToString("C4"));
//OutPut : $12345.1234
Console.WriteLine(value.ToString("C5"));
//OutPut : $12345.12345
Console.WriteLine(value.ToString("C6"));
//OutPut : $12345.123450

Console output:

It works!

decimal moneyvalue = 1921.39m; 
string html = String.Format("Order Total: {0:C}", moneyvalue); 
Console.WriteLine(html);

Output

Order Total: $1,921.39

Once you have your string in a double/decimal to get it into the correct formatting for a specific locale use

double amount = 1234.95;

amount.ToString("C") // whatever the executing computer thinks is the right fomat

amount.ToString("C", System.Globalization.CultureInfo.GetCultureInfo("en-ie"))    //  €1,234.95
amount.ToString("C", System.Globalization.CultureInfo.GetCultureInfo("es-es"))    //  1.234,95 € 
amount.ToString("C", System.Globalization.CultureInfo.GetCultureInfo("en-GB"))    //  £1,234.95 

amount.ToString("C", System.Globalization.CultureInfo.GetCultureInfo("en-au"))    //  $1,234.95
amount.ToString("C", System.Globalization.CultureInfo.GetCultureInfo("en-us"))    //  $1,234.95
amount.ToString("C", System.Globalization.CultureInfo.GetCultureInfo("en-ca"))    //  $1,234.95

Try simple like this

 var amtf = $"{Convert.ToDecimal(amt):#0.00}";

    string s ="000000000100";
    decimal iv = 0;
    decimal.TryParse(s, out iv);
    Console.WriteLine((iv / 100).ToString("0.00"));

//Extra currency symbol and currency formatting: "€3,311.50":
String result = (Decimal.Parse("000000331150") / 100).ToString("C");

//No currency symbol and no currency formatting: "3311.50"
String result = (Decimal.Parse("000000331150") / 100).ToString("f2");

you can also do :

string.Format("{0:C}", amt)

Try something like this:

decimal moneyvalue = 1921.39m;
string html = String.Format("Order Total: {0:C}", moneyvalue);
Console.WriteLine(html);

In my case, I used this string format to display currency from decimal values without the symbol.

String format:

string.Format("{0:#,##0.00}", decimalValue)

Example:

var decimalNumbers = new decimal[] { 1M, 10M, 100M, 1000M,10000M,100000M,1000000M,1000000000M };          

foreach (var decimalNumber in decimalNumbers)
{
   Console.WriteLine(string.Format("{0:#,##0.00}", decimalNumber));
}

Parse to your string to a decimal first.

var tests = new[] {"000000001000", "000000001005", "000000331150"};
foreach (var test in tests)
{
    Console.WriteLine("{0} <=> {1:f2}", test, Convert.ToDecimal(test) / 100);
}

Since you didn't ask for the currency symbol, I've used "f2" instead of "C"

try

amtf =  amtf.Insert(amtf.Length - 2, ".");

 private string cxp(string txt) {
        try
        {

            decimal n;
            n = Math.Round( Convert.ToDecimal( txt),2);

            string newTxt;
            newTxt = Convert.ToString(n);
            //txt = txt.Replace(",", ".");
            //string newtxt = string.Format("{0:#.00}", Convert.ToDecimal(txt) );

            return newTxt.Replace(",", ".");

        }
        catch (Exception e)
        {
            MessageBox.Show(e.Message ,"Error al parsear número");
            //throw;
            return txt;
        }


    }