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

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