diff --git a/lang/csharp/src/apache/main/Generic/GenericDatumReader.cs b/lang/csharp/src/apache/main/Generic/GenericDatumReader.cs
index 76a95b94ead..1ec126b3aa4 100644
--- a/lang/csharp/src/apache/main/Generic/GenericDatumReader.cs
+++ b/lang/csharp/src/apache/main/Generic/GenericDatumReader.cs
@@ -98,16 +98,16 @@ public GenericEnumAccess(EnumSchema schema)
 
             public object CreateEnum(object reuse, int ordinal)
             {
-                if (reuse is GenericEnum)
+                if (reuse is GenericEnum ge)
                 {
-                    var ge = (GenericEnum) reuse;
-                    if (ge.Schema.Equals(this.schema))
+                    if (ge.Schema.Equals(schema))
                     {
-                        ge.Value = this.schema[ordinal];
+                        ge.Value = schema[ordinal];
                         return ge;
                     }
                 }
-                return new GenericEnum(this.schema, this.schema[ordinal]);
+
+                return new GenericEnum(schema, schema[ordinal]);
             }
         }
 
@@ -204,12 +204,12 @@ class GenericMapAccess : MapAccess
         {
             public object Create(object reuse)
             {
-                if (reuse is IDictionary<string, object>)
+                if (reuse is IDictionary<string, object> result)
                 {
-                    var result = (IDictionary<string, object>)reuse;
                     result.Clear();
                     return result;
                 }
+
                 return new Dictionary<string, object>();
             }
 
diff --git a/lang/csharp/src/apache/main/Generic/PreresolvingDatumReader.cs b/lang/csharp/src/apache/main/Generic/PreresolvingDatumReader.cs
index 61273e85a49..22c80407dde 100644
--- a/lang/csharp/src/apache/main/Generic/PreresolvingDatumReader.cs
+++ b/lang/csharp/src/apache/main/Generic/PreresolvingDatumReader.cs
@@ -319,15 +319,14 @@ private ReadItem ResolveUnion(UnionSchema writerSchema, Schema readerSchema)
 
             for (int i = 0; i < writerSchema.Count; i++)
             {
-                var writerBranch = writerSchema[i];
+                Schema writerBranch = writerSchema[i];
 
-                if (readerSchema is UnionSchema)
+                if (readerSchema is UnionSchema unionReader)
                 {
-                    var unionReader = (UnionSchema) readerSchema;
-                    var readerBranch = unionReader.MatchingBranch(writerBranch);
+                    int readerBranch = unionReader.MatchingBranch(writerBranch);
                     if (readerBranch == -1)
                     {
-                        lookup[i] = (r, d) => { throw new AvroException( "No matching schema for " + writerBranch + " in " + unionReader ); };
+                        lookup[i] = (r, d) => { throw new AvroException("No matching schema for " + writerBranch + " in " + unionReader); };
                     }
                     else
                     {
@@ -338,7 +337,7 @@ private ReadItem ResolveUnion(UnionSchema writerSchema, Schema readerSchema)
                 {
                     if (!readerSchema.CanRead(writerBranch))
                     {
-                        lookup[i] = (r, d) => { throw new AvroException( "Schema mismatch Reader: " + ReaderSchema + ", writer: " + WriterSchema ); };
+                        lookup[i] = (r, d) => { throw new AvroException("Schema mismatch Reader: " + ReaderSchema + ", writer: " + WriterSchema); };
                     }
                     else
                     {