C#

class Controller
{
   SynchronizationContext eventRaisingContext;

   ...

   public Controller(SynchronizationContext context)
   {
      eventRaisingContext = context;
   }

   private void DataClassModifiedHandler()
   {
      eventRaisingContext.Post(UpdateTreeView);
   }

   void UpdateTreeView(object state)
   {
       // Do the UI updates here.
   }
}

Controller myController = new Controller(WindowsFormsSynchronizationContext.Current);

// Using FileInfo and FileAttributes as an example
FileInfo info = new FileInfo(@"c:\windows\explorer.exe");
 
// Test to see if the file is read-only
if ((info.Attributes & FileAttributes.ReadOnly) == FileAttributes.ReadOnly)
{
   // more code here...
}
else
{
   // file isn't read-only...other code here...
}

SqlConnction cnn = new SqlConnection("Data Source=YourCopmputerName;Initial Catalog=YouDatabaseName;User Id=databaseUserName;Password=DatabasePassword");<br />
string strSql="SELECT id,name FROM Table1";<br />
DataSet ds = new DataSet();<br />
SqlDataAdapter da = new SqlDataAdapter(strSql,cnn);<br />
da.fill(ds,"Table1");<br />
if (ds.Tables[0].Rows.Count != 0)<br />
{<br />
TextBox1.Text = ds.Tables[0].Rows[0][1].toString();<br />
}<br />