[Release 5.0] Fix missing HostNameInCertificate connection string property issue in .NET Framework (#1782)

Author: cheenamalhotra

src/Microsoft.Data.SqlClient/netfx/ref/Microsoft.Data.SqlClient.cs

@@ -1037,6 +1037,10 @@ public SqlConnectionStringBuilder(string connectionString) { }
         [System.ComponentModel.DisplayNameAttribute("Encrypt")]
         [System.ComponentModel.RefreshPropertiesAttribute(System.ComponentModel.RefreshProperties.All)]
         public SqlConnectionEncryptOption Encrypt { get { throw null; } set { } }
+        /// <include file='../../../../doc/snippets/Microsoft.Data.SqlClient/SqlConnectionStringBuilder.xml' path='docs/members[@name="SqlConnectionStringBuilder"]/HostNameInCertificate/*'/>
+        [System.ComponentModel.DisplayNameAttribute("Host Name In Certificate")]
+        [System.ComponentModel.RefreshPropertiesAttribute(System.ComponentModel.RefreshProperties.All)]
+        public string HostNameInCertificate { get { throw null; } set { } }
         /// <include file='../../../../doc/snippets/Microsoft.Data.SqlClient/SqlConnectionStringBuilder.xml' path='docs/members[@name="SqlConnectionStringBuilder"]/Enlist/*'/>
         [System.ComponentModel.DisplayNameAttribute("Enlist")]
         [System.ComponentModel.RefreshPropertiesAttribute(System.ComponentModel.RefreshProperties.All)]

src/Microsoft.Data.SqlClient/tests/FunctionalTests/SqlConnectionStringBuilderTest.cs

@@ -360,6 +360,17 @@ public void SetEncryptOnConnectionBuilderMapsToString()
             }
         }
 
+        [Fact]
+        public void AbleToSetHostNameInCertificate()
+        {
+            var testhostname = "somedomain.net";
+            var builder = new SqlConnectionStringBuilder
+            {
+                HostNameInCertificate = testhostname
+            };
+            Assert.Equal(testhostname, builder.HostNameInCertificate);
+        }
+
         [Fact]
         public void ConnectionBuilderEncryptBackwardsCompatibility()
         {