//當主表選擇行更改後，顯示相應的採購資料        private void dgvMain_SelectionChanged(object sender, EventArgs e)        {            if (this.dgvMain.SelectedRows.Count > 0 && this.dgvItem.DataSource != null && this.dgvItem.Rows.Count > 0)            {                string fMaterielCode = this.dgvMain.SelectedRows[0].Cells["colMfMaterialCode"].Value.ToString().Trim();                                int fSpcId = 0;                object oSpcId = this.dgvMain.SelectedRows[0].Cells["colMfSpcId"].Value;                if (oSpcId != null && oSpcId.ToString().Length > 0)                    fSpcId = Convert.ToInt32(oSpcId);                //int fSpcId = Convert.ToInt32(this.dgvMain.SelectedRows[0].Cells["colMfSpcId"].Value.ToString().Trim());                CurrencyManager cm = (CurrencyManager)BindingContext[dgvItem.DataSource];                cm.SuspendBinding();                for (int i = 0; i < dgvItem.Rows.Count; i++)                {                    if (dgvItem.Rows[i].Cells["colfMaterielCode"].Value.ToString().Trim().Equals(fMaterielCode) &&                        Convert.ToInt32(dgvItem.Rows[i].Cells["colfSpcId"].Value.ToString()) == fSpcId)                    {                        dgvItem.Rows[i].Visible = true;                    }                    else                    {                        dgvItem.Rows[i].Visible = false;                    }                }                cm.ResumeBinding();            }        } //显示/隐藏等待框        public void ShowLoading(string strMsg)        {            if (strMsg.Trim() != "") //顯示            {                this.Cursor = Cursors.WaitCursor;                lblLoadingMsg.Text = (strMsg.Trim() == "" ? "正在处理中" : strMsg) + "，请稍等...";                pnlLoading.Visible = true;                pnlLoading.BringToFront();                Application.DoEvents();            }            else                //隱藏            {                pnlLoading.Visible = false;                this.Cursor = Cursors.Default;            }        }