string searchText = string.Empty; 
          TreeNode lastNode = null; 
          TreeNode lastNodeParent = null; 
   
          private void button1_Click(object sender, EventArgs e) 
          { 
              if (string.IsNullOrWhiteSpace(tbFind.Text.ToUpper())) 
                  return; 
   
              TreeNodeCollection collection = null; 
              if (searchText == tbFind.Text.ToUpper() && lastNodeParent != null) 
              { 
                  collection = lastNodeParent.Nodes; 
              } 
              else 
              { 
                  collection = treeView1.Nodes; 
              } 
   
              searchText = tbFind.Text.ToUpper(); 
   
              bool result = RecursiveNodeSearch(collection, searchText); 
              if (!result) 
                  MessageBox.Show(string.Format("'{0}' not found", tbFind.Text), "Not Found", MessageBoxButtons.OK, MessageBoxIcon.Warning); 
   
              if (!result) 
              { 
                  ResetSearch(); 
              } 
          } 
   
   
          public void ResetSearch() 
          { 
              searchText = string.Empty; 
              lastNode = null; 
              lastNodeParent = null; 
   
          } 
   
          bool RecursiveNodeSearch(TreeNodeCollection collection, string searchText) 
          { 
              bool result = false; 
              if (collection.Count <= 0) 
                  return result; 
   
              foreach (TreeNode item in collection) 
              { 
                  if (item.Text.ToUpper().Contains(searchText.ToUpper())) 
                  { 
                      if (treeView1.SelectedNode != null) 
                      { 
                          lastNode = treeView1.SelectedNode; 
                      } 
                      if (lastNode == item) 
                          continue; 
                       
                      item.Expand(); 
   
                      treeView1.SelectedNode = item; 
                      treeView1.Select(); 
                      item.EnsureVisible(); 
   
                      lastNode = item; 
                      lastNodeParent = item.Parent; 
   
                      result = true; 
   
                      return result; 
                  } 
   
                  if (item.Nodes.Count > 0) 
                  { 
                      result = RecursiveNodeSearch(item.Nodes, searchText); 
                      lastNodeParent = item; 
                  } 
   
                  if (result) 
                      break; 
              } 
   
              return result; 
          } 
  

Module Module1 
   
      Sub Main() 
          Dim sayi1 As Integer 
          Dim girilenislem 
          Dim sayi2 As Integer 
          Dim sonuc As String 
          Dim girilensayi1 As String 
          Dim girilensayi2 As String 
          Console.Write("İşlem yapılacak ilk sayıyı giriniz: ") 
          girilensayi1 = Console.ReadLine 
          If Not IsNumeric(girilensayi1) Then 
              Console.WriteLine("sayi girmediniz") 
              Console.ReadKey() 
              End 
          ElseIf IsNumeric(girilensayi1) 
              sayi1 = girilensayi1 
          End If 
          Console.WriteLine("Yapmak istediğiniz islemi giriniz [ + - / * ]: ") 
          girilenislem = Console.ReadLine 
          If Not girilenislem = "+" Or "-" Or "/" Or "*" Then 
              Console.WriteLine("İslemi yanlıs girdiniz.") 
              Console.ReadKey() 
              End 
          End If 
          Console.Write("İşlem yapılacak ikinci sayıyı giriniz: ") 
          girilensayi2 = Console.ReadLine 
          If Not IsNumeric(girilensayi2) Then 
              Console.WriteLine("sayi girmediniz") 
              Console.ReadKey() 
              End 
          ElseIf IsNumeric(girilensayi2) 
              sayi2 = girilensayi2 
          End If 
          If girilenislem = "+" Then 
              sonuc = sayi1 & " " & girilenislem & " " & sayi2 & " " & "=" & " " & sayi1 + sayi2 
          ElseIf girilenislem = "/" 
              sonuc = sayi1 & " " & girilenislem & " " & sayi2 & " " & "=" & " " & sayi1 / sayi2 
          ElseIf girilenislem = "-" 
              sonuc = sayi1 & " " & girilenislem & " " & sayi2 & " " & "=" & " " & sayi1 - sayi2 
          ElseIf girilenislem = "*" 
              sonuc = sayi1 & " " & girilenislem & " " & sayi2 & " " & "=" & " " & sayi1 * sayi2 
          End If 
   
          Console.WriteLine(sonuc) 
   
   
          Console.Read() 
   
   
      End Sub 
   
  End Module

1) 
  struct DATE { 
       int day; 
  }; 
  struct PERSON { 
       char name[30]; 
       struct DATE birthday; 
    
  }; 
   
  2) 
  struct PERSON { 
  char name[30]; 
           struct DATE { 
                 int day; 
    } birthday; 
  };