1、資料來源繫結後，再篩選指定項，要保留value值、text值情況下

 //控制元件cmbDJXL  
 if (cmbDJXL.Items.Count > 1)
            {
                    //得到原先繫結資料來源
                    DataTable dt = (DataTable)cmbDJXL.DataSource;
                    DataTable dtp = dt.Clone();
                    DataRow[] rows = dt.Select(" SJDM NOT IN （1,2）");
                    foreach (DataRow row in rows)    
                    {
                        dtp.Rows.Add(row.ItemArray);
                    }
                    //二次篩選得到已排除資料
                    DataRow dr = dtp.NewRow();
                    //可插入一行空行
                    dtp.Rows.InsertAt(dr, 0);
                    cmbDJXL.DataSource = dtp;
                    //繫結Text
                    cmbDJXL.DisplayMember = "SJMC";
                    //繫結value
                    cmbDJXL.ValueMember = "SJDM";
            }
 

2、移除指定項，只有text值情況下

 if (cmbDJXL.Items.Count > 1)
            {
                for (int i = 0; i < this.cmbDJXL.Items.Count; i++)
                {
                    string a = cmbDJXL.Items[i] + "";
                    if (a.Contains("房"))
                    {
                        cmbDJXL.Items.Remove(a);
                        i--;
                    }
                }
            }

補充：獲取指定項值
 if (cmbDJXL.Items.Count > 1)
           {
                for (int i = 0; i < this.cmbDJXL.Items.Count; i++)
                {
                    DataRowView tmpRow = (DataRowView)cmbDJXL.Items[i];
                    string value = tmpRow["SJDM"]+"";
                    string text = tmpRow["SJMC"] + "";
                }
            }