C# | Uri.CheckHostName(String) Method

Uri.CheckHostName(String) Method is used to determine whether the specified host name is a valid DNS name or not.

Syntax: public static UriHostNameType CheckHostName (string name);
Here, it takes the host name to validate. This can be an IPv4 or IPv6 address or an Internet host name.

Return Value: This method returns a UriHostNameType which indicates the type of the host name. If the type of the host name cannot be determined or if the host name is null or a zero-length string, this method returns Unknown.

Below programs illustrate the use of Uri.CheckHostName() Method:

Example 1:

// C# program to demonstrate the
// Uri.CheckHostName(string) Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {
        // Declaring and initializing uri
        string uri = "www.geeksforgeeks.org";

        // using CheckHostName() method
        UriHostNameType value = Uri.CheckHostName(uri);

        // Displaying the result
        Console.WriteLine("Host type is: {0}", value);
    }
}

Output:

Host type is: Dns

Example 2:

// C# program to demonstrate the
// Uri.CheckHostName(string) Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {
        // Declaring and initializing uri
        string uri = "http:// localhost:3000";

        // using CheckHostName() method
        UriHostNameType value = Uri.CheckHostName(uri);

        // Displaying the result
        Console.WriteLine("Host type is: {0}", value);
    }
}

Output:

Host type is: Unknown

Reference:

• https://docs.microsoft.com/en-us/dotnet/api/system.uri.checkhostname?view=netstandard-2.1