I want to insert either one value or another to the database depending on if the user choses to update a value or not.

            try
            {
                SqlConnection conn1 = new SqlConnection(ConfigurationManager.ConnectionStrings["ProjectDatabaseConnectionString"].ConnectionString);
              
                        conn1.Open();
                            SqlCommand com1;
                            string insertQuery = "update Personal set PersonalEmail = @email,FirstName = @fname, Surname = @sname,TelephoneNo = @telno, Password = @password Where UserName = '" + LblUserName .Text+ "'";
                            com1 = new SqlCommand(insertQuery, conn1);
                            if (TextBoxNewEmail.Text.Trim() != null)
                            {
                                com1.Parameters.AddWithValue("@email", TextBoxNewEmail.Text);
                            }
                            else
                            {
                                com1.Parameters.AddWithValue("@email", LblOldEmail.Text);
//LblOldEmail holds the value of the users old email 
// TextBoxNewEmail is the textbox where the user enters there new email if they are updating it 

                            }
                
                
                            com1.Parameters.AddWithValue("@password", TextBoxNewPassword.Text);
                            com1.Parameters.AddWithValue("@fname", TextBoxFirstName.Text);
                            com1.Parameters.AddWithValue("@sname", TextBoxSurName.Text);
                            com1.Parameters.AddWithValue("@telno", TextBoxTelNo.Text);
                            // com1.Parameters.AddWithValue("@location", locID);
                            com1.Parameters.AddWithValue("@conText", RadioButtonListText.SelectedValue);
                            com1.Parameters.AddWithValue("@conEmail", RadioButtonListEmail.SelectedValue);


                            com1.ExecuteNonQuery();
                            conn1.Close();
							
							

                        Response.Write("Update was successful");
                    }
                
            
            catch (Exception ex)
            {
                Response.Write("error" + ex.ToString());
            }