C# | Decimal.ToString Method | Set -1 - GeeksforGeeks

29 Mar, 2019
Decimal.ToString() Method is used to convert the numeric value of the current instance to its equivalent string representation using the specified culture-specific format information. There are 4 methods in the overload list of this method as follows:
ToString() Method
ToString(IFormatProvider) Method
ToString(String, IFormatProvider) Method
ToString(String) Method
Here, we will discuss the first two methods.
This method is used to convert the numeric value of the current instance to its equivalent string representation.
Syntax: public override string ToString ();
Return Value: This method returns a string which represents the value of the current instance.
Below programs illustrate the use of Decimal.ToString() Method:
Example 1:
// C# program to demonstrate the// Decimal.ToString() Methodusing System;  class GFG {      // Main Method    public static void Main()    {          // Declaring and initializing value        decimal value = 7922816251426433759354.39503305M;          // using ToString() method        string str = value.ToString();          // Display the value        Console.WriteLine("String value is {0}", str);    }}
String value is 7922816251426433759354.3950330

Example 2:
// C# program to demonstrate the// Decimal.ToString() Methodusing System;using System.Globalization;  class GFG {      // Main Method    public static void Main()    {        // calling get() method        Console.WriteLine("Equivalent String values are:");        get(20);        get(30);        get(40);        get(4294967295);    }      // defining get() method    public static void get(decimal value)    {          // using ToString() method        string str = value.ToString();          // Display the value        Console.WriteLine("String value is {0}", str);    }}
Equivalent String values are:
String value is 20
String value is 30
String value is 40
String value is 4294967295

This method is used to convert the numeric value of the current instance to its equivalent string representation, using the specified format.
Syntax: public string ToString (string format);Here, it takes a standard or custom numeric format string.
Return Value: This method returns the string representation of the value of the current instance as specified by format.
Exceptions: This method throws FormatException if format is invalid.
Example 1:
// C# program to demonstrate the// Decimal.ToString(String) Methodusing System;  class GFG {      // Main Method    public static void Main()    {        try {              // Declaring and initializing value            decimal value = 16325.62m;              // Declaring and initializing format            string s = "E04";              // using the method            string str = value.ToString(s);              // Display the value            Console.WriteLine("String value is {0}", str);        }          catch (FormatException e)         {            Console.WriteLine("Format is invalid.");            Console.Write("Exception Thrown: ");            Console.Write("{0}", e.GetType(), e.Message);        }    }}
String value is 1.6326E+004

Example 2: For FormatException
// C# program to demonstrate the// Decimal.ToString(String) Methodusing System;  class GFG {      // Main Method    public static void Main()    {        try {              // Declaring and initializing value            decimal value = 16325.62m;              // Declaring and initializing format            string s = "a";              // using the method            string str = value.ToString(s);              // Display the value            Console.WriteLine("String value is {0}", str);        }          catch (FormatException e)         {            Console.WriteLine("Format is invalid.");            Console.Write("Exception Thrown: ");            Console.Write("{0}", e.GetType(), e.Message);        }    }}
Format is invalid.
Exception Thrown: System.FormatException

Reference:
https://docs.microsoft.com/en-us/dotnet/api/system.decimal.tostring?view=netframework-4.7.2
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