似乎无法让我的comboBox选择任何东西

Question

我正在使用datareader从我的数据库中读取数据并将它们存储到字符串中。但我似乎无法使用存储在字符串上的数据来对我的comboBox做任何事情，就像我想要它在if语句上做的那样。

我有一个comboBox选择的索引语句，它正常工作。

if (cboBase.SelectedIndex == 0)
            {
                cboTeam.Items.Clear();
                cboTeam.Items.Add("1");
                cboTeam.Items.Add("2");
                cboTeam.Items.Add("3");
                cboTeam.Items.Add("4");
                cboTeam.Items.Add("6");
                cboTeam.Items.Add("8");
                cboTeam.SelectedIndex = 0;
            }
            else if (cboBase.SelectedIndex == 1)
            {
                cboTeam.Items.Clear();
                cboTeam.Items.Add("5");
                cboTeam.Items.Add("7");
                cboTeam.Items.Add("9");
                cboTeam.Items.Add("10");
                cboTeam.SelectedIndex = 0;
            }
            else
            {
                cboTeam.Items.Clear();
                cboTeam.Items.Add("11");
                cboTeam.Items.Add("12");
                cboTeam.Items.Add("13");
                cboTeam.Items.Add("14");
                cboTeam.SelectedIndex = 0;
            }

当我使用我的datareader数据来选择cboBase时，一切正常。但是，当我尝试使用相同的方法来选择cboTeam并执行clickButton上的点击时，它无法正常工作......有人可以指导我走正确的道路吗？

SqlConnection con = new SqlConnection(constring);
                con.Open();
                SqlCommand cmd = new SqlCommand("SELECT EmployeeID, HomeBase, TeamID, StaffType, PIC From Employee WHERE EmployeeID ='" + txtEmployeeID.Text + "'", con);
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                SqlDataReader reader = cmd.ExecuteReader();
                string EmployeeID = null;
                string HomeBase = null;
                string TeamID = null;
                string Position = null;
                string PIC = null;
                while (reader.Read())
                {
                    EmployeeID = reader.GetInt32(0).ToString();
                    HomeBase = reader.GetString(1).ToString();
                    TeamID = reader.GetInt32(2).ToString();
                    Position = reader.GetInt32(3).ToString();
                    PIC = reader.GetInt32(4).ToString();

                }
                if (HomeBase == "JUR")
                {
                    cboBase.SelectedIndex = 0;
                }
                else if (HomeBase == "LVR")
                {
                    cboBase.SelectedIndex = 1;
                }
                else if (HomeBase == "SBW")
                {
                    cboBase.SelectedIndex = 2;
                }
                else if (TeamID == "1")
                {
                    cboTeam.SelectedIndex = 0;
                }
                else if (TeamID == "2")
                {
                    cboTeam.SelectedIndex = 1;
                }
                else if (TeamID == "3")
                {
                    cboTeam.SelectedIndex = 2;
                }
                else if (TeamID == "4")
                {
                    cboTeam.SelectedIndex = 3;
                }
                else if (TeamID == "6")
                {
                    cboTeam.SelectedIndex = 4;
                }
                else if (TeamID == "8")
                {
                    cboTeam.SelectedIndex = 5;
                }
                else if (TeamID == "5")
                {
                    cboTeam.SelectedIndex = 0;
                }
                else if (TeamID == "7")
                {
                    cboTeam.SelectedIndex = 1;
                }
                else if (TeamID == "8")
                {
                    cboTeam.SelectedIndex = 2;
                }
                else if (TeamID == "10")
                {
                    cboTeam.SelectedIndex = 3;
                }
                else if (TeamID == "11")
                {
                    cboTeam.SelectedIndex = 0;
                }
                else if (TeamID == "12")
                {
                    cboTeam.SelectedIndex = 1;
                }
                else if (TeamID == "13")
                {
                    cboTeam.SelectedIndex = 2;
                }
                else if (TeamID == "14")
                {
                    cboTeam.SelectedIndex = 3;
                }
                else if (Position == "1")
                {
                    cboPosition.SelectedIndex = 0;
                }
                else if (Position == "2")
                {
                    cboPosition.SelectedIndex = 1;
                }
                else if (Position == "3")
                {
                    cboPosition.SelectedIndex = 2;
                }
                else if (PIC == "1")
                {
                    radioPIC.PerformClick();
                }
                else if (PIC == "0")
                {
                    radioNo.PerformClick();
                }