c# – 更新背景工作者winforms中的标签文本

public void bw_Convert_DoWork(object sender,DoWorkEventArgs e)
    {           
        e.Result = e.Argument;
        for (int i = 0; i <  fTable.Rows.Count; i++)
        {
            try
            {
                SqlCommand cmd = new SqlCommand("INSERT INTO TBL_CDR_ANALYZER (LNG_UPLOAD_ID,DAT_START,LNG_DURATION,INT_DIRECTION,INT_CALL_DATA_TYPE,n" +
                    "TXT_TARGET_NUMBER,TXT_OTHER_PARTY_NUMBER,TXT_TARGET_IMSI,TXT_TARGET_IMEI,TXT_TARGET_CELL_ID,TXT_ROAMING_NETWORK_COMPANY_NAME) VALUES n" +
                    "(@UPLOAD_ID,@START_DATE,@DURATION,@DIRECTION,@CALL_TYPE,@TARGET_NUMBER,@OTHER_PARTY_NUMBER,@IMSI,@IMEI,@CELL_ID,@ROAMING_NAME)",sqlCon);
                cmd.Parameters.Add("@UPLOAD_ID",SqlDbType.Int).Value = 1;
                cmd.Parameters.Add("@START_DATE",SqlDbType.DateTime).Value = fTable.Rows[i]["CallDate"];
                cmd.Parameters.Add("@DURATION",SqlDbType.Int).Value = fTable.Rows[i]["CallDuration"];
                cmd.Parameters.Add("@DIRECTION",SqlDbType.Int).Value = GetCallDirection(fTable.Rows[i]["CallDirection"].ToString());
                cmd.Parameters.Add("@CALL_TYPE",SqlDbType.Int).Value = GetCallType(fTable.Rows[i]["CallType"].ToString());
                cmd.Parameters.Add("@TARGET_NUMBER",SqlDbType.VarChar,25).Value = fTable.Rows[i]["TargetNo"];
                cmd.Parameters.Add("@OTHER_PARTY_NUMBER",25).Value = fTable.Rows[i]["OtherPartyNo"];
                cmd.Parameters.Add("@IMSI",50).Value = fTable.Rows[i]["IMSI"];
                cmd.Parameters.Add("@IMEI",50).Value = fTable.Rows[i]["IMEI"];
                cmd.Parameters.Add("@CELL_ID",50).Value = fTable.Rows[i]["CellID"];
                cmd.Parameters.Add("@ROAMING_NAME",SqlDbType.NVarChar,255).Value = fTable.Rows[i]["RoamingCompany"];
                sqlCon.Open();
                cmd.ExecuteNonQuery();
                sqlCon.Close();
            }
            catch (SqlException ex)
            {

            }
            finally
            {
                sqlCon.Close();
            }
            bw_Convert.ReportProgress((100 * i) / fTable.Rows.Count);  
            **Label1.Text = i.ToString() + "Files Converted";** // getting error Here.                  
        }    
    }

如何在这里更新Label1文本？