Update listview by using threading

FailChanel.Text = SucChannel.Text = "";
            successChannel = "";
            failedChannel = "";
            failCount = 0;
            listView1.Items.Clear();
            listView1.Enabled = false;
            string getdatafrommethod = GetDat(openFileDialog1);
            //check if user don't select the file 
            //if don't select file the return value will be empty 
            //and in the blew code will be return
            if (getdatafrommethod == "Empty")
                return;
           string[] yaArray = getdatafrommethod.Split(new string[] { Environment.NewLine }, StringSplitOptions.None);
             progressBar1.Value = 1;
            progressBar1.Visible = true;
            progressBar1.Maximum = yaArray.Length;
            
            foreach (string item in yaArray)
            {
                //the next code for the last line in the item 
                //when the last line is empty , continue the loop that will be finish
                //and when the file is empty
                if (item.Length == 0)
                    continue;
                listViewRow = item.Split(new string[] { "," }, StringSplitOptions.None); //Now we split on the semi colon to give us each item

                if (!this.CheckLogin(listViewRow[1], listViewRow[0]))
                {
                    failedChannel += "\r\n" + " Channel number : " + listViewRow[1] + " is failed to connect";
                    failCount++;
                    continue;
                }

                successChannel += listViewRow[0] + "," + listViewRow[1] + "\r\n";
                newItem = new ListViewItem(listViewRow[1]);
                newItem.SubItems.Add(listViewRow[0]);
                listView1.Items.Add(newItem);
               
                progressBar1.PerformStep();
            }
           
            
            listView1.Enabled = true;
            progressBar1.Visible = false;
            failedChannel += "\r\n" + " Total blocked channel is : "+failCount;
            SucChannel.Text = "Success channel : " + listView1.Items.Count;
            FailChanel.Text = "Failed channel : " + failCount;
            savefile(ChiledBlockChnannel, true, failedChannel);
            savefile(ChiledSucssesChannel, true, successChannel);
            
         

        }