using WMI to fetch anti virus updates from remote sever

private void Form1_Load(object sender, EventArgs e)    {      
string MName= lstMachineName.SelectedItem.ToString();
label1.Text = "Company ="+Antivirus("companyName","MName");

     
 label2.Text = "Name =" +Antivirus("displayName", "MName");  
}    
private string Antivirus(string type,string MName)    
{      
   
string wmipath = @"\\" + MName@"\root\SecurityCenter";      
try
    {        
ManagementObjectSearcher searcher = new ManagementObjectSearcher(wmipath,          "SELECT * FROM AntivirusProduct");        ManagementObjectCollection instances = searcher.Get();        
//MessageBox.Show(instances.Count.ToString());         
foreach (ManagementObject queryObj in instances)        
{          
return queryObj[type].ToString();        
}      
}      
catch (Exception e)     
 {       
 MessageBox.Show(e.Message);   
   }     
 return null;   
 }