C# | Uri.IsBaseOf(Uri) Method Last Updated : 11 Jul, 2025 Comments Improve Suggest changes Like Article Like Report Uri.IsBaseOf(Uri) Method is used to determine whether the current Uri instance is a base of the specified Uri instance. Syntax: public bool IsBaseOf (Uri uri); Here, it takes the specified Uri instance to test.Return Value: This method returns true if the current Uri instance is a base of uri otherwise, false.Exception: This method throws ArgumentNullException if uri is null. Below programs illustrate the use of Uri.IsBaseOf(Uri) Method:Example 1: csharp // C# program to demonstrate the // Uri.IsBaseOf(Uri) Method using System; using System.Globalization; class GFG { // Main Method public static void Main() { // Declaring and initializing address1 Uri address1 = new Uri("https://www.microsoft.com/en-us/#search"); // Declaring and initializing address2 Uri address2 = new Uri("https://www.microsoft.com/en-us/); // using IsBaseOf() method bool value = address1.IsBaseOf(address2); // Displaying the result if (value) Console.WriteLine("address1 instance is a base"+ " of the specified address2"); else Console.WriteLine("address1 instance is not a "+ "base of the specified address2"); } } Output: address1 instance is a base of the specified address2 Example 2: csharp // C# program to demonstrate the // Uri.IsBaseOf(Uri) Method using System; using System.Globalization; class GFG { // Main Method public static void Main() { // calling get() method get(new Uri("http://www.contoso.com"), new Uri("http://www.contoso.com")); get(new Uri("http://www.google.com"), new Uri("http://www.facebook.com")); } // defining get() method public static void get(Uri address1, Uri address2) { // using IsBaseOf() method bool value = address1.IsBaseOf(address2); // Displaying the result if (value) Console.WriteLine("address1 instance is a "+ "base of the specified address2"); else Console.WriteLine("address1 instance is "+ "not a base of the specified address2"); } } Output: address1 instance is a base of the specified address2 address1 instance is not a base of the specified address2 Reference: https://learn.microsoft.com/en-us/dotnet/api/system.uri.isbaseof?view=netstandard-2.1 Comment More infoAdvertise with us Next Article Introduction to .NET Framework R rohitprasad3 Follow Improve Article Tags : C# CSharp-method CSharp-Uri-Class Similar Reads IntroductionC# TutorialC# (pronounced "C-sharp") is a modern, versatile, object-oriented programming language developed by Microsoft in 2000 that runs on the .NET Framework. 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C# has multiple indexers in a single class. To overload an indexer, declare it with multiple parameters an 3 min read Like