Fixed Issue 63 with test.

src/NetTopologySuite.IO.Esri.Shapefile/Dbf/DbfReader.cs

@@ -152,6 +152,7 @@ private void Initialize(Stream stream, Encoding encoding = null)
         internal void Restart()
         {
             DbfStream.Seek(HeaderSize, SeekOrigin.Begin);
+            CurrentIndex = 0;
         }
 
 

test/NetTopologySuite.IO.Esri.Test/Issues/Issue063.cs

@@ -0,0 +1,25 @@
+using NUnit.Framework;
+
+namespace NetTopologySuite.IO.Esri.Test.Issues;
+
+/// <summary>
+/// https://github.com/NetTopologySuite/NetTopologySuite.IO.Esri/issues/63
+/// </summary>
+internal class Issue063
+{
+    [Test]
+    public void ShapefileResetTest()
+    {
+        var shpPath = TestShapefiles.PathTo("nested_polygons.shp"); 
+        using var shpReader = Shapefile.OpenRead(shpPath);
+
+        // This test need a shapefile with one feature (RecordCount == 1)
+        Assert.That(shpReader.RecordCount, Is.EqualTo(1));
+
+        var readOk = shpReader.Read();
+        Assert.IsTrue(readOk);
+        shpReader.Restart();
+        readOk = shpReader.Read();
+        Assert.IsTrue(readOk);
+    }
+}