C#

Jamie Nordmeyer wrote:

AJAX stands for Asynchronous Javascript and ActiveX

Jamie Nordmeyer wrote:

My personal favorite AJAX implementation is one called My Ajax.NET, soon to be called Anthem.NET, and is a completely free implementation. You can find it here: http://jason.diamond.name/weblog/category/my-ajax-dot-net/[^]

public class MyTestPage : System.Web.UI.Page
{
   protected void Page_Load(object sender, EventArgs e)
   {
      // The second param is used to name the class used in your client side code.
      // So if you expose a method called GetTable, you'd call it in your Javascript
      // like this: Callback.GetTable();
      Ajax.Manager.Register(this, "Callback");

      if (!Page.IsPostBack)
      {
         ...
      }
   }

   // Next, we define our callback methods.  They MUST be scoped as public, and you mark
   // them using the Ajax.MethodAttribute.  If you don't need the values from your server
   // controls, mark IncludeControlValuesWithCallBack as false.
   [Ajax.Method(IncludeControlValuesWithCallBack = false))]
   public int Add(int x, int y)
   {
      return x + y;
   }

   // We can return back several object types as well, including DataTable objects.
   [Ajax.Method()]
   public DataTable GetClientInfo(int clientID)
   {
      return this.ConnectToDatabaseAndRetrieveData(clientID);
   }
}

<script language="javascript">
function onSomeButtonClick()
{
   var cmb = document.getElementById('cmbClients');
   var clientID = cmb.options[cmb.selectedIndex].value;
   
   // Now we call our callback method, whose code is implemented server side.
   var dtbl = Callback.GetClientInfo(clientID);

   // We can now use our datatable as follows:
   for (var i = 0; i < dtbl.Rows.length; i++)
   {
      alert(dtbl.Rows[0].ClientName + '\n' +
      dtbl.Rows[0].Address1 + '\n' +
      dtbl.Rows[0].City  + '\n' +
      dtbl.Rows[0].State  + '\n' +
      dtbl.Rows[0].ZipCode);
   }
}
</script>

[Ajax.Method()]
public void SumFunc()

Or

[Ajax.Method(IncludeControlValuesWithCallBack = true)]
public void SumFunc()

DataTable tables = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables,
   new object[] {null, null, null, null});
string[] tableNames = new string[tables.Rows.Count];
for(int i = 0; i < tables.Rows.Count; i++) {
   string temp = tables.Rows[i][TABLE_NAME_COLUMN].ToString();
   if(tables.Rows[i]["TABLE_TYPE"].ToString() == "TABLE") {
      tableNames[i] = temp;
   }
}

 // The using statement will automatically Close and Dispose the
// FileStream when you're done using it
using(FileStream fs = new FileStream(fileName, FileMode.Open))
{
    PictureBox1.Image = Image.FromStream(fs);
}