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I have this method:

public static string XmlSerialize<T>(T data)

 string result;
 using (StringWriter stringWriter = new StringWriter())
 
 XmlWriterSettings settings = new XmlWriterSettings
 
 Encoding = Encoding.UTF8,
 OmitXmlDeclaration = true,
 ;
 using (XmlWriter writer = XmlWriter.Create(stringWriter, settings))
 
 XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
 ns.Add("", "");
 XmlSerializer serializer = XmlSerializer.FromTypes(new[] typeof(T) )[0];
 serializer.Serialize(writer, data, ns);
 
 result = stringWriter.ToString();
 

 return result;

This is simple method to serialize object into xml. But this method have memory leak, and I haven't idea where is it.

Can anyone help me find it?

The problem is with a leak in XMLSerializer and it is an official behavior by design.

MS Documenation on XMLSerializer

Dynamically Generated Assemblies

To increase performance, the XML
serialization infrastructure dynamically generates assemblies to
serialize and deserialize specified types. The infrastructure finds
and reuses those assemblies. This behavior occurs only when using the
following constructors:

XmlSerializer.XmlSerializer(Type) 
XmlSerializer.XmlSerializer(Type, String)

If you use any of the other
constructors, multiple versions of the same assembly are generated and
never unloaded, which results in a memory leak and poor performance.
The easiest solution is to use one of the previously mentioned two
constructors. Otherwise, you must cache the assemblies in a Hashtable,
as shown in the following example

And read more here on SO for XmlSerializer.FromTypes:

XmlSerializer.FromTypes producing memory leaks?

You should release the resources from the memory by using Dispose() method because C# garbage collector doesn't do that to any object has Dispose() method.

public static string XmlSerialize<T>(T data)

string result;
using (StringWriter stringWriter = new StringWriter())

 XmlWriterSettings settings = new XmlWriterSettings
 
 Encoding = Encoding.UTF8,
 OmitXmlDeclaration = true,
 ;
 using (XmlWriter writer = XmlWriter.Create(stringWriter, settings))
 
 XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
 ns.Add("", "");
 XmlSerializer serializer = XmlSerializer.FromTypes(new[] typeof(T) )[0];
 serializer.Serialize(writer, data, ns);
 if (writer != null)
 writer.Dispose();
 
 result = stringWriter.ToString();
 if (stringWriter != null)
 stringWriter.Dispose();


return result;