remove IsDirectionValid

Author: DavoudEshtehari

src/Microsoft.Data.SqlClient/src/Microsoft/Data/Common/AdapterUtilCommon.cs

@@ -592,24 +592,18 @@ internal static Transaction GetCurrentTransaction()
         internal static bool IsDirection(DbParameter value, ParameterDirection condition)
         {
 #if DEBUG
-            IsDirectionValid(condition);
+            switch (condition)
+            { // @perfnote: Enum.IsDefined
+                case ParameterDirection.Input:
+                case ParameterDirection.Output:
+                case ParameterDirection.InputOutput:
+                case ParameterDirection.ReturnValue:
+                    break;
+                default:
+                    throw ADP.InvalidParameterDirection(condition);
+            }
 #endif
             return (condition == (condition & value.Direction));
-
-            // local function
-            static void IsDirectionValid(ParameterDirection value)
-            {
-                switch (value)
-                { // @perfnote: Enum.IsDefined
-                    case ParameterDirection.Input:
-                    case ParameterDirection.Output:
-                    case ParameterDirection.InputOutput:
-                    case ParameterDirection.ReturnValue:
-                        break;
-                    default:
-                        throw ADP.InvalidParameterDirection(value);
-                }
-            }
         }
 
         internal static void IsNullOrSqlType(object value, out bool isNull, out bool isSqlType)