gistfile1.cs

public class EmtpyStatementRemoval : CSharpSyntaxRewriter
{
    public override SyntaxNode VisitEmptyStatement(EmptyStatementSyntax node)
    {
        //Construct an EmptyStatementSyntax with a missing semicolon
        return node.WithSemicolonToken(
            SyntaxFactory.MissingToken(SyntaxKind.SemicolonToken)
                .WithLeadingTrivia(node.SemicolonToken.LeadingTrivia)
                .WithTrailingTrivia(node.SemicolonToken.TrailingTrivia));
    }
}

public static void Main(string[] args)
{
    var tree = CSharpSyntaxTree.ParseText(@"
    public class Sample
    {
       public void Foo()
       {
          Console.WriteLine();
          #region SomeRegion
          //Some other code
          #endregion
          ;
        }
    }");

    var rewriter = new EmtpyStatementRemoval();
    var result = rewriter.Visit(tree.GetRoot());
    Console.WriteLine(result.ToFullString());
}