using System.Management;
using System.Threading;

DataTable oDt = new DataTable();


public Form1()
{      
      oDt.Columns.Add("System Name");
      oDt.Columns.Add("Software/Hardware");
      oDt.Columns.Add("Caption");
      oDt.Columns.Add("Configuration");
} 

private void btnLstSoftwares_Click(object sender, EventArgs e)
{
      string[] sArr = null;
      for (int i = 0; i < comboBox1.Items.Count; i++)
      {
         sArr = comboBox1.Items[i].ToString().Split('=');                
         ThreadPool.QueueUserWorkItem(new WaitCallback(MyThread), sArr[1].ToString());                                 
      }
}

public void MyThread(object oSysName)
{
            lock (this)
            {
                string sSysName = (string)oSysName;
                try
                {                    
                    ConnectionOptions connection = new ConnectionOptions();
                    connection.Username = "administrator";
                    connection.Password = "admin";                    

                    ManagementScope scope = new ManagementScope("\\\\" + sSysName.ToString() + "\\root\\CIMV2", connection);
                    scope.Connect();
	            ObjectQuery queryProduct = new ObjectQuery("SELECT * FROM Win32_Product");
                    ManagementObjectSearcher searcherProduct = new ManagementObjectSearcher(scope, queryProduct);
	  
	 	    foreach (ManagementObject queryObjSw in searcherProduct.Get())
                    {
                        DataRow oDr1;
                        oDr1 = oDt.NewRow();
                        oDr1[0] = sSysName;
                        oDr1[1] = "Software";
                        oDr1[2] = "Caption";
                        oDr1[3] = queryObjSw["Caption"].ToString();
                        oDt.Rows.Add(oDr1);
                    }
                catch (ManagementException oMnEx)
                {
                    DataRow oDr1;
                    oDr1 = oDt.NewRow();
                    oDr1[0] = sSysName;
                    oDr1[1] = "Error";
                    oDr1[2] = "";
                    oDr1[3] = oMnEx.Message.ToString();
                    oDt.Rows.Add(oDr1);                   
                }
                catch (System.UnauthorizedAccessException unauthorizedErr)
                {
                    DataRow oDr1;
                    oDr1 = oDt.NewRow();
                    oDr1[0] = sSysName;
                    oDr1[1] = "Error";
                    oDr1[2] = "";
                    oDr1[3] = unauthorizedErr.Message.ToString();
                    oDt.Rows.Add(oDr1);
                    
                }
                catch (Exception oEx)
                {
                    DataRow oDr1;
                    oDr1 = oDt.NewRow();
                    oDr1[0] = sSysName;
                    oDr1[1] = "Error";
                    oDr1[2] = "";
                    oDr1[3] = oEx.Message.ToString();
                    oDt.Rows.Add(oDr1);
                    
                }                
                dataGridView1.ReadOnly = true;
                dataGridView1.DataSource = oDt;
            }
        }
}