C#winform datagridview的问题


    public partial class frmMain : Form
    {
......
        private void frmMain_Load(object sender, EventArgs e)
        {
            this.dgvImport.DataSource = SHOWPROCESSEDFILE2;
            if (dgvImport.Rows.Count > 0)
            {
                selectedGridRow = dgvImport.Rows[0];
            }
        }
        private void getGridList()
        {
                try
                {
                    RefreshGrid();
                }
                catch (Exception ex)
                {
                }
            }
        }
        private void axGoButton_ClickEvent(object sender, EventArgs e)
        {
            thgrv = new Thread(getGridList);
            thgrv.IsBackground = true;
            thgrv.Start();
        }
        private void RefreshGrid()
        {
                SHOWPROCESSEDFILE2.Rows.Clear();
//这里会报错 为什么呢？
                foreach (ProcessedFiles.PROCESSEDFILERow r in resultPROCESSEDFILERows)
                {
......
                    SHOWPROCESSEDFILE2.Rows.Add(pRow);
                }
            }
        }求高手解答我的困惑