diff --git a/dotnet/src/webdriver/CookieJar.cs b/dotnet/src/webdriver/CookieJar.cs
index 0f2695b96a2de..470d81653cdff 100644
--- a/dotnet/src/webdriver/CookieJar.cs
+++ b/dotnet/src/webdriver/CookieJar.cs
@@ -74,16 +74,16 @@ public void AddCookie(Cookie cookie)
         /// Delete the cookie by passing in the name of the cookie
         /// </summary>
         /// <param name="name">The name of the cookie that is in the browser</param>
-        /// <exception cref="ArgumentNullException">If <paramref name="name"/> is <see langword="null"/>.</exception>
+        /// <exception cref="ArgumentException">If <paramref name="name"/> is <see langword="null"/> or <see cref="string.Empty"/>.</exception>
         public void DeleteCookieNamed(string name)
         {
-            if (name is null)
+            if (string.IsNullOrWhiteSpace(name))
             {
-                throw new ArgumentNullException(nameof(name));
+                throw new ArgumentException("Cookie name cannot be null or empty", nameof(name));
             }
 
-            Dictionary<string, object> parameters = new Dictionary<string, object>();
-            parameters.Add("name", name);
+            Dictionary<string, object> parameters = new() { { "name", name } };
+
             driver.InternalExecute(DriverCommand.DeleteCookie, parameters);
         }
 
@@ -115,11 +115,12 @@ public void DeleteAllCookies()
         /// </summary>
         /// <param name="name">name of the cookie that needs to be returned</param>
         /// <returns>A Cookie from the name; or <see langword="null"/> if not found.</returns>
+        /// <exception cref="ArgumentException">If <paramref name="name"/> is <see langword="null"/> or <see cref="string.Empty"/>.</exception>
         public Cookie? GetCookieNamed(string name)
         {
             if (string.IsNullOrWhiteSpace(name))
             {
-                throw new ArgumentException("Cookie name cannot be empty", nameof(name));
+                throw new ArgumentException("Cookie name cannot be null or empty", nameof(name));
             }
 
             try
diff --git a/dotnet/src/webdriver/ICookieJar.cs b/dotnet/src/webdriver/ICookieJar.cs
index f9eb69a4824bc..b73a3085c6aba 100644
--- a/dotnet/src/webdriver/ICookieJar.cs
+++ b/dotnet/src/webdriver/ICookieJar.cs
@@ -61,7 +61,7 @@ public interface ICookieJar
         /// Deletes the cookie with the specified name from the page.
         /// </summary>
         /// <param name="name">The name of the cookie to be deleted.</param>
-        /// <exception cref="ArgumentNullException">If <paramref name="name"/> is <see langword="null"/>.</exception>
+        /// <exception cref="ArgumentException">If <paramref name="name"/> is <see langword="null"/> or <see cref="string.Empty"/>.</exception>
         void DeleteCookieNamed(string name);
 
         /// <summary>
diff --git a/dotnet/test/common/CookieImplementationTest.cs b/dotnet/test/common/CookieImplementationTest.cs
index a329895d79b7d..2cc8a3c5cc2e8 100644
--- a/dotnet/test/common/CookieImplementationTest.cs
+++ b/dotnet/test/common/CookieImplementationTest.cs
@@ -620,6 +620,28 @@ public void DeleteAllCookiesDifferentUrls()
             AssertCookieIsPresentWithName(cookie2.Name);
         }
 
+        [Test]
+        [TestCase(null)]
+        [TestCase("")]
+        [TestCase("   ")]
+        public void ShouldThrowWhenGetInvalidCookieByName(string cookieName)
+        {
+            var getCookieAction = () => driver.Manage().Cookies.GetCookieNamed(cookieName);
+
+            Assert.That(getCookieAction, Throws.ArgumentException);
+        }
+
+        [Test]
+        [TestCase(null)]
+        [TestCase("")]
+        [TestCase("   ")]
+        public void ShouldThrowWhenDeleteInvalidCookieByName(string cookieName)
+        {
+            var deleteCookieAction = () => driver.Manage().Cookies.DeleteCookieNamed(cookieName);
+
+            Assert.That(deleteCookieAction, Throws.ArgumentException);
+        }
+
         //------------------------------------------------------------------
         // Tests below here are not included in the Java test suite
         //------------------------------------------------------------------