不同操作系统下的ConnectionString

/// <summary>
/// Integrated Security connection string
/// </summary>
public const string ConnectionString = "data source=localhost;initial catalog=DatabaseName;integrated security=SSPI;persist security info=False;packet size=4096";
   
/// <summary>
/// SQL Security connection string
/// </summary>
public const string ConnectionString2 = @"data source=localhost;initial catalog=DatabaseName;persist security info=False;user id=sa;packet size=4096";

private void Global_Load(object sender, System.EventArgs e)
{

   
try
{
   //先采用windows认证方式（安全性高，适用于windows2000,xp），失败则执行catch{}
   cnn.ConnectionString = ConnectionString;
   cnn.Open();
}
catch
{
   try
   {
    //采用SQL Server Security验证用户身份（适用于win98,2000,xp）
   cnn.ConnectionString = ConnectionString2;
   cnn.Open();
   }
   catch (Exception ex)
   {
   MessageBox.Show(ex.Message);
   }
  }
}