convert VB to C#

Pilz.Simple3DFileParser/Model/Mesh.cs

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+using System.Collections.Generic;
+using global::System.Numerics;
+
+namespace Pilz.S3DFileParser
+{
+    public class Mesh
+    {
+        public List<Vertex> Vertices { get; private set; } = new List<Vertex>();
+        public List<Normal> Normals { get; private set; } = new List<Normal>();
+        public List<UV> UVs { get; private set; } = new List<UV>();
+        public List<VertexColor> VertexColors { get; private set; } = new List<VertexColor>();
+        public List<Face> Faces { get; private set; } = new List<Face>();
+
+        public void CenterModel()
+        {
+            CenterModel(new[] { this });
+        }
+
+        public static void CenterModel(IEnumerable<Mesh> meshes)
+        {
+            int avgX = 0;
+            int avgY = 0;
+            int avgZ = 0;
+            long vertsCount = 0L;
+            foreach (Mesh m in meshes)
+            {
+                foreach (Vertex v in m.Vertices)
+                {
+                    avgX = (int)(avgX + v.X);
+                    avgY = (int)(avgY + v.Y);
+                    avgZ = (int)(avgZ + v.Z);
+                }
+
+                vertsCount += m.Vertices.Count;
+            }
+
+            var avg = new Vector3(avgX, avgY, avgZ);
+            avg /= new Vector3(vertsCount);
+            foreach (Mesh m in meshes)
+            {
+                foreach (Vertex v in m.Vertices)
+                {
+                    v.X -= avg.X;
+                    v.Y -= avg.Y;
+                    v.Z -= avg.Z;
+                }
+            }
+        }
+    }
+}