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C# | Int64.ToString Method | Set - 1

Last Updated : 11 Jul, 2025

Int64.ToString Method is used to convert the numeric value of the current instance to its equivalent string representation. There are 4 methods in the overload list of this method as follows:

1. ToString(IFormatProvider) Method
2. ToString(String, IFormatProvider) Method
3. ToString( ) Method
4. ToString(String) Method

Here we will discuss the first two methods.

This method is used to convert the numeric value of this instance to its equivalent string representation using the specified culture-specific format information.
Syntax:

public string ToString (IFormatProvider provider);

Parameters: This method takes an object of type IFormatProvider which supplies culture-specific formatting information.
Return Value: This method returns the string representation of the value of the current object in the format specified by the provider parameter.
Example:

// C# program to demonstrate
// Int64.ToString(IFormatProvider)
// Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {
        // declaring and initializing
        // Int64 value
        long val = Int64.MaxValue;

        // creating and initializing
        // the object of CultureInfo
        CultureInfo provider = new CultureInfo("en-us");

        // using the method
        string str = val.ToString(provider);

        // Display the value
        Console.WriteLine("The Value is {0} and provider is {1}",
                                             str, provider.Name);
    }
}

The Value is 9223372036854775807 and provider is en-US

This method is used to convert the numeric value of this instance to its equivalent string representation using the specified format and culture-specific formatting information.

Syntax: public string ToString (string format, IFormatProvider provider);
Parameters: 
format: It is a numeric format string. 
provider: It is an object which supplies culture-specific formatting information.
Return Value: This method returns the string representation of the value of the current instance as specified by format and provider. 
 

Example:

// C# program to demonstrate the
// Int64.ToString(String, IFormatProvider)
// Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {

        // declaring and initializing
        // Int64 value
        long val = 4627836321;

        // creating and initializing
        // the object of CultureInfo
        CultureInfo provider = new CultureInfo("fr-FR");

        // declaring and initializing format
        string format = "D5";

        // using the method
        string str = val.ToString(format, provider);

        // Displaying the details
        Console.WriteLine("The value is {0}",str);
        Console.WriteLine("The Format is {0}",format);
        Console.WriteLine("The Provider is {0}", provider.Name);
    }
}

The value is 4627836321
The Format is D5
The Provider is fr-FR

Reference: 

• https://learn.microsoft.com/en-us/dotnet/api/system.Int64.tostring?view=netframework-4.7.2

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