当未选择日期时，WPF Datepicker将1/1/1900添加到数据库

我有一个包含多个日期选择器的WPF应用程序。并非所有的Datepickers都会选择一个日期。如果未选择日期，则会将1/1/1900的值插入SQL数据库。我在C＃中尝试了一些逻辑，但它在任何地方都没有得到
。如果没有选择日期，我不希望SQL数据库更新该值。

I have a WPF app that contains several datepickers. Not all the Datepickers will always have a date selected. When a date is not selected a value of 1/1/1900 is being inserted into the SQL database. I have tried some if logic within my C# but it's not getting me anywhere. When a date is not selected, I don't want the SQL database to get updated for that value.

请帮助！

using (SqlConnection sqlcon2 = new SqlConnection(sqlDb))
                            {
                                sqlcon2.Open();
                                string insertStatement = "INSERT INTO tblTracking " +
                                    "(Status,Package,Version,Package_Name,ActionPlan_ProgressNotes,BUILD_Install,CERT_Install,MOCK_Install,TRAIN_Install,PROD_Install,Owner_Requester,Priority,Date_Added,Meaningful_Use,FLASH,CWxPI,Notes,Dependency_Package) " +
                                    "Values (@Status, @Package, @Version, @Package_Name,@ActionPlan_ProgressNotes, @BUILD_Install, @CERT_Install, @MOCK_Install, @TRAIN_Install, @PROD_Install, @Owner_Requester, @Priority, @Date_Added, @Meaningful_Use, @FLASH, @CWxPI, @Notes, @Dependency_Package)";
                                SqlCommand insertCommand = new SqlCommand(insertStatement, sqlcon2);
                                insertCommand.Parameters.AddWithValue("@Status", cmbStatus1.Text);
                                insertCommand.Parameters.AddWithValue("@Package", tbPackage.Text);
                                insertCommand.Parameters.AddWithValue("@Version", tbVersion.Text);
                                insertCommand.Parameters.AddWithValue("@Package_Name", tbName.Text);
                                insertCommand.Parameters.AddWithValue("@ActionPlan_ProgressNotes", tbPlan.Text);
                                if(dpBUILD.Text !="")
                                {
                                    insertCommand.Parameters.AddWithValue("@BUILD_Install", dpBUILD.Text);
                                }
                                else
                                    insertCommand.Parameters.AddWithValue("@BUILD_Install", "");
                                if (dpCERT.Text !="")
                                {
                                    insertCommand.Parameters.AddWithValue("@CERT_Install", dpCERT.Text);
                                }
                                else
                                    insertCommand.Parameters.AddWithValue("@CERT_Install", "");
                                if (dpMOCK.Text !="")
                                {
                                    insertCommand.Parameters.AddWithValue("@MOCK_Install", dpMOCK.Text);
                                }
                                else
                                    insertCommand.Parameters.AddWithValue("@MOCK_Install", "");
                                if (dpTRAIN.Text !="")
                                {
                                    insertCommand.Parameters.AddWithValue("@TRAIN_Install", dpTRAIN.Text);
                                }
                                else
                                    insertCommand.Parameters.AddWithValue("@TRAIN_Install", "");
                                if (dpPROD.Text !="")
                                {
                                    insertCommand.Parameters.AddWithValue("@PROD_Install", dpPROD.Text);
                                }
                                else
                                    insertCommand.Parameters.AddWithValue("@PROD_Install", "");
                                insertCommand.Parameters.AddWithValue("@Owner_Requester", tbOwner.Text);
                                insertCommand.Parameters.AddWithValue("@Priority", tbPriority.Text);
                                insertCommand.Parameters.AddWithValue("@Date_Added", dpDateAdded.Text);
                                insertCommand.Parameters.AddWithValue("@Meaningful_Use", tbMeaningfulUse.Text);
                                insertCommand.Parameters.AddWithValue("@FLASH", tbFlash.Text);
                                insertCommand.Parameters.AddWithValue("@CWxPI", tbCWxPI.Text);
                                insertCommand.Parameters.AddWithValue("@Notes", tbNotes.Text);
                                insertCommand.Parameters.AddWithValue("@Dependency_Package", tbDependency.Text);
                                insertCommand.ExecuteNonQuery();
                                sqlcon2.Close();
                            }