C programlama dilinde string adında bir veri türü yoktur. C dili string veri türü yerine char adında bir veri türüne sahiptir. char veri türü ile meselâ B, x veya * gibi tek karakter ifade edilir. Eğer bir yazıyı değişkende saklamak gerekirse char türünden bir dizi oluşturmak gerekir. Karakterlerin bir dizisi olarak yazı ifade edilir.

C# programlama dilinde de char veri türü vardır ( .net Framework içerisindeki String.Char yapısının bir aliası olarak ). Fakat C dilindeki char ile C# dilindeki char arasındaki benzerlik sadece isim benzerliğidir. İşlevleri ve yapıları farklıdır. C# dilinde bir karakter dizisini string ifadeye, string ifadeyi de karakter dizisine dönüştürmek mümkündür; fakat “string veri türü yalnızca bir karakter dizisidir” demek doğru değil, çünkü string kendi başına bir veri türüdür.

<%@ page language="VB" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Net" %>
<%@ Import Namespace="System.IO" %>
 <script language="VB" runat="server">
     Private Sub downloadButton_OnClick(ByVal sender As Object, ByVal e As System.EventArgs)
         Dim url As String = "http://www.tcmb.gov.tr/kurlar/today.html"
         Dim strVeri As String = GetHTML(url)
         Dim iDolar As String = InStr(strVeri, "USD")
         Dim iEuro As String = InStr(strVeri, "EUR")
         Dim strDolarAlis As String = Mid(strVeri, iDolar + 38, 10)
         Dim strDolarSatis As String = Mid(strVeri, iDolar + 51, 10)
         Dim strEuroAlis As String = Mid(strVeri, iEuro + 38, 11)
         Dim strEuroSatis As String = Mid(strVeri, iEuro + 51, 11)
         Response.Write(strDolarAlis & "<br>")
         Response.Write(strDolarSatis & "<br>")
         Response.Write(strEuroAlis & "<br>")
         Response.Write(strEuroSatis)
        
     End Sub
     Private Function GetHTML(ByVal strURL As String) As String
         Dim objResponse As WebResponse = Nothing
         Dim strHTML As String
         Try
             Dim objUri As Uri = New Uri(strURL)
             Dim objRequest As WebRequest = WebRequest.Create(objUri)
             objResponse = objRequest.GetResponse
             Dim objStream As Stream = objResponse.GetResponseStream

             Dim encode As Encoding = System.Text.Encoding.UTF8
             Dim objReader As StreamReader = New StreamReader(objStream, encode)
             strHTML = objReader.ReadToEnd
         Catch ex As Exception
             Return ex.ToString
         Finally
             objResponse.Close()
         End Try
         Return strHTML
     End Function
     Private Function Post(ByVal strURL As String, ByVal strPostData As String) As String
         Dim objResponse As WebResponse = Nothing
         Dim strResult As String = Nothing
         Try
             Dim objUri As Uri = New Uri(strURL)
             Dim objRequest As WebRequest = WebRequest.Create(objUri)
             objRequest.Method = "POST"
             objRequest.ContentType = "application/x-www-form-urlencoded"
             Dim UrlEncoded As StringBuilder = New StringBuilder
             Dim reserved As Char() = {"?"c, "="c, "&"c}
             Dim SomeBytes As Byte() = Nothing
             If Not (strPostData Is Nothing) Then
                 Dim i As Integer = 0
                 Dim j As Integer
                 While i < strPostData.Length
                     j = strPostData.IndexOfAny(reserved, i)
                     If j = -1 Then
                         UrlEncoded.Append(HttpUtility.UrlEncode(strPostData.Substring(i, strPostData.Length - i)))
                         ' break
                     End If
                     UrlEncoded.Append(HttpUtility.UrlEncode(strPostData.Substring(i, j - i)))
                     UrlEncoded.Append(HttpUtility.UrlEncode(strPostData.Substring(j, 1)))
                     i = j + 1
                 End While
                 SomeBytes = Encoding.UTF8.GetBytes(UrlEncoded.ToString)
                 objRequest.ContentLength = SomeBytes.Length
                 Dim objStream As Stream = objRequest.GetRequestStream
                 objStream.Write(SomeBytes, 0, SomeBytes.Length)
                 objStream.Close()
             Else
                 objRequest.ContentLength = 0
             End If
             objResponse = objRequest.GetResponse
             Dim objReceiveStream As Stream = objResponse.GetResponseStream
             Dim encode As Encoding = System.Text.Encoding.UTF8
             Dim objReader As StreamReader = New StreamReader(objReceiveStream, encode)
             strResult = objReader.ReadToEnd
         Catch ex As Exception
             Return ex.ToString
         Finally
             If Not (objResponse Is Nothing) Then
                 objResponse.Close()
             End If
         End Try
         Return strResult
     End Function
 </script>
<form id="Form1" runat="server">
<asp:button id="downloadButton" runat="server" text="Download" tabindex="2" onclick = "downloadButton_OnClick"></asp:button>
</form>