C＃ファイルの保存ダイアログボックスのエラー

Question

私は車のための簡単なプロジェクトを作成しました。私は任意のユーザーを登録し、アクセスデータベースに保存します。ダイアログボックスが表示され、ダイアログボックスが表示され、ダイアログボックスが表示されているときにそのユーザーを保存するよう尋ねると、アクセス違反例外について出てきます。直し方。 私はいくつかのブログとこのエラーについての記事を読んでいますが、正しい解決策を提供しておらず、正しいアイデアも投稿していません。 以下は私の完全なコードです。どうすれば修正できますか？

  using System; 
     using System.Collections.Generic; 
     using System.ComponentModel; 
     using System.Data; 
     using System.Drawing; 
     using System.Linq; 
     using System.Text; 
     using System.Windows.Forms; 
     using System.Configuration; 
     using System.Data.OleDb; 
     using MessagingToolkit.QRCode.Codec; 
     using MessagingToolkit.QRCode.Codec.Data; 
     using System.IO; 
     using NPR.Properties; 

     namespace NPR 
     { 
     public partial class UserAdd : Form 
     { 
     public UserAdd() 
     { 
     InitializeComponent(); 
     } 
     private int userId = 0; 
     public int UserId 
     { 
     get { return userId; } 
     set { userId = value; } 
     } 

     private bool isUpdate = false; 
     public bool IsUpdate 
     { 
     get { return isUpdate; } 
     set { isUpdate = value; } 

     } 

     private void UpdateRecord() 
     { 
     string connString = ConfigurationManager.ConnectionStrings["dbx"].ConnectionString; 
     string cmdString = "Update users SET u_name = @name,u_car_no = @car_no, u_mobile_no = @mobile_no,u_license_no = @license_no,u_reg_date = @reg_date , u_image=@firstimage,u_car_background=@secondimage WHERE Id = @userId"; 
     using (OleDbConnection con = new OleDbConnection(connString)) 
     { 
     using (OleDbCommand cmd = new OleDbCommand(cmdString, con)) 
     { 
     con.Open(); 

     cmd.Parameters.AddWithValue("@name", NameTextBox.Text); 
     cmd.Parameters.AddWithValue("@car_no", PlateNoTextBox.Text); 
     cmd.Parameters.AddWithValue("@mobile_no", MobileTextBox.Text); 
     cmd.Parameters.AddWithValue("@license_no", LicenseTextBox.Text); 
     cmd.Parameters.AddWithValue("@reg_date", DateTime.Text); 
     cmd.Parameters.AddWithValue("@firstimage", savePhoto()); 
     cmd.Parameters.AddWithValue("@secondimage", savePhoto2()); 
     cmd.Parameters.AddWithValue("@userId", this.userId); 
     cmd.ExecuteNonQuery(); 
     } 
     } 
     } 

     private void SaveRecord() 
     { 
     string connString = ConfigurationManager.ConnectionStrings["dbx"].ConnectionString; 
     string cmdString = "INSERT INTO users (u_name,u_car_no,u_mobile_no,u_license_no,u_reg_date,u_image,u_car_background) VALUES (@name,@car_no,@mobile_no,@license_no,@reg_date,@firstimage,@secondimage)"; 
     using (OleDbConnection con = new OleDbConnection(connString)) 
     { 
     using (OleDbCommand cmd = new OleDbCommand(cmdString, con)) 
     { 
     con.Open(); 
     cmd.Parameters.AddWithValue("@name", NameTextBox.Text); 
     cmd.Parameters.AddWithValue("@car_no", PlateNoTextBox.Text); 
     cmd.Parameters.AddWithValue("@mobile_no", MobileTextBox.Text); 
     cmd.Parameters.AddWithValue("@license_no", LicenseTextBox.Text); 
     cmd.Parameters.AddWithValue("@reg_date", DateTime.Text); 
     cmd.Parameters.AddWithValue("@firstimage", savePhoto()); 
     cmd.Parameters.AddWithValue("@secondimage", savePhoto2()); 

     cmd.ExecuteNonQuery(); 
     } 
     } 
     } 

     private byte[] savePhoto() 
     { 
     MemoryStream ms = new MemoryStream(); 
     FirstpictureBox.Image.Save(ms, FirstpictureBox.Image.RawFormat); 
     return ms.GetBuffer(); 
     } 
     private byte[] savePhoto2() 
     { 
     MemoryStream ms = new MemoryStream(); 
     SecondpictureBox.Image.Save(ms, SecondpictureBox.Image.RawFormat); 
     return ms.GetBuffer(); 
     } 

     private bool IsValidated() 
     { 
     if (NameTextBox.Text.Trim() == string.Empty) 
     { 
     MessageBox.Show("Name is Required.", "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Error); 
     NameTextBox.Focus(); 
     return false; 
     } 
     if (PlateNoTextBox.Text.Trim() == string.Empty) 
     { 
     MessageBox.Show("Car Plate No. is Required.", "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Error); 
     PlateNoTextBox.Focus(); 
     return false; 
     } 
     if (MobileTextBox.Text.Trim() == string.Empty) 
     { 
     MessageBox.Show("Mobile No. is Required.", "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Error); 
     MobileTextBox.Focus(); 
     return false; 
     } 
     if (LicenseTextBox.Text.Trim() == string.Empty) 
     { 
     MessageBox.Show("License No. is Required.", "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Error); 
     NameTextBox.Focus(); 
     return false; 
     } 
     if (DateTime.Text.Trim() == string.Empty) 
     { 
     MessageBox.Show("Date is Required.", "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Error); 
     DateTime.Focus(); 
     return false; 
     } 
     return true; 

     } 

     private DataTable GetUserInfoById() 
     { 
     DataTable dtUsersInfo = new DataTable(); 
     string connString = ConfigurationManager.ConnectionStrings["dbx"].ConnectionString; 
     string cmdString = "SELECT * FROM users WHERE Id = @UserId"; 
     using (OleDbConnection con = new OleDbConnection(connString)) 
     { 
     using (OleDbCommand cmd = new OleDbCommand(cmdString, con)) 
     { 
     con.Open(); 
     cmd.Parameters.AddWithValue("@UserId", this.UserId); 
     OleDbDataReader reader = cmd.ExecuteReader(); 
     dtUsersInfo.Load(reader); 
     } 
     } 

     return dtUsersInfo; 
     } 

     private Image LoadImg(byte[] img) 
     { 
     MemoryStream ms = new MemoryStream(img); 
     return Image.FromStream(ms); 
     } 

     private void button2_Click(object sender, EventArgs e) 
     { 
     this.Close(); 
     } 

     private void SecondpictureBox_Click(object sender, EventArgs e) 
     { 
     OpenFileDialog ofd = new OpenFileDialog(); 
     ofd.Title = "Select Car Background Image"; 
     ofd.Filter = "Image File(*.png;*.jpg;*.bmp;*.gif)|*.png;*.jpg;*.bmp;*.gif"; 
     if (ofd.ShowDialog() == DialogResult.OK) 
     { 
     SecondpictureBox.Image = new Bitmap(ofd.FileName); 
     } 
     } 

     private void FirstpictureBox_Click(object sender, EventArgs e) 
     { 
     OpenFileDialog ofd = new OpenFileDialog(); 
     ofd.Title = "Select User Profile Image"; 
     ofd.Filter = "Image File(*.png;*.jpg;*.bmp;*.gif)|*.png;*.jpg;*.bmp;*.gif"; 
     if (ofd.ShowDialog() == DialogResult.OK) 
     { 
     FirstpictureBox.Image = new Bitmap(ofd.FileName); 
     } 
     } 

     private void button3_Click(object sender, EventArgs e) 
     { 
     DataTable dtUsers = GetUserInfoById(); 
     DataRow row = dtUsers.Rows[0]; 
     PlateNoTextBox.Text = row["u_car_no"].ToString(); 

     string connString = ConfigurationManager.ConnectionStrings["dbx"].ConnectionString; 
     string cmdString = "DELETE * FROM users WHERE Id = @UserId"; 
     using (OleDbConnection con = new OleDbConnection(connString)) 
     { 
     using (OleDbCommand cmd = new OleDbCommand(cmdString, con)) 
     { 
     con.Open(); 
     cmd.Parameters.AddWithValue("@UserId", this.UserId); 
     cmd.ExecuteNonQuery(); 
     } 
     } 
     string connString2 = ConfigurationManager.ConnectionStrings["dbx"].ConnectionString; 
     string camdString = "Update slots SET u_name = @name,u_car_no = @car_no,Status = 0 WHERE u_car_no = @slotId"; 
     using (OleDbConnection conn = new OleDbConnection(connString2)) 
     { 
     using (OleDbCommand cmd = new OleDbCommand(camdString, conn)) 
     { 
     conn.Open(); 
     cmd.Parameters.AddWithValue("@name", " "); 
     cmd.Parameters.AddWithValue("@car_no", " "); 
     cmd.Parameters.AddWithValue("@slotId", row["u_car_no"]); 
     cmd.ExecuteNonQuery(); 
     conn.Close(); 
     conn.Dispose(); 
     } 
     } 
     MessageBox.Show("User Deleted Successfully.", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information); 
     this.Close(); 
     } 

     private void viewDataToolStripMenuItem_Click(object sender, EventArgs e) 
     { 
     this.Hide(); 
     AllUserDetail mef = new AllUserDetail(); 
     mef.ShowDialog(); 
     } 

     private void toolStripMenuItem1_Click(object sender, EventArgs e) 
     { 
     this.Hide(); 
     Dashboard dsh = new Dashboard(); 
     dsh.ShowDialog(); 
     } 

     private void UserAdd_Load(object sender, EventArgs e) 
     { 
     if (this.IsUpdate) 
     { 
     DataTable dtUsers = GetUserInfoById(); 
     DataRow row = dtUsers.Rows[0]; 
     NameTextBox.Text = row["u_name"].ToString(); 
     PlateNoTextBox.Text = row["u_car_no"].ToString(); 
     MobileTextBox.Text = row["u_mobile_no"].ToString(); 
     LicenseTextBox.Text = row["u_license_no"].ToString(); 
     DateTime.Text = row["u_reg_date"].ToString(); 
     FirstpictureBox.Image = (row["u_image"] is DBNull) ? Resources.no_thumb : LoadImg((byte[])row["u_image"]); 
     SecondpictureBox.Image = (row["u_car_background"] is DBNull) ? Resources.no_thumb : LoadImg((byte[])row["u_car_background"]); 
     } 
     } 

     private void button1_Click(object sender, EventArgs e) 
     { 
     if (IsValidated()) 
     { 
     try 
     { 
     if (this.isUpdate) 
     { 
     UpdateRecord(); 
     String plate = PlateNoTextBox.Text; 
     QRCodeEncoder encoder = new QRCodeEncoder(); 
     Bitmap qrcode = encoder.Encode(plate); 
     qrimage.Image = qrcode as Image; 
     MessageBox.Show("Record Updated Successfully.", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information); 
     SaveFileDialog s = new SaveFileDialog(); 
     s.Title = "Save QR Code"; 
     s.Filter = "JPEG|*.jpg|PNG|*.png|BMP|*.bmp|GIF|*.gif"; 
     if (s.ShowDialog() == System.Windows.Forms.DialogResult.OK) 
     { 
     try 
     { 
     qrimage.Image.Save(s.FileName); 
     } 
     catch (ApplicationException ex) 
     { 
     MessageBox.Show("ERROR:" + ex.Message, "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Error); 

     } 
     } 
     } 
     else 
     { 
     SaveRecord(); 
     String plate = PlateNoTextBox.Text; 
     QRCodeEncoder encoder = new QRCodeEncoder(); 
     Bitmap qrcode = encoder.Encode(plate); 
     qrimage.Image = qrcode as Image; 
     MessageBox.Show("Record Save Successfully.", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information); 
     SaveFileDialog s = new SaveFileDialog(); 
     s.Title = "Save QR Code"; 
     s.Filter = "JPEG|*.jpg|PNG|*.png|BMP|*.bmp|GIF|*.gif"; 

     if (s.ShowDialog() == DialogResult.OK) 
     { 
     try 
     { 
     qrimage.Image.Save(s.FileName); 
     } 
     catch (ApplicationException ex) 
     { 
     MessageBox.Show("ERROR:" + ex.Message, "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Error); 
     } 
     } 
     } 
     this.Close(); 
     } 
     catch (ApplicationException ex) 
     { 
     MessageBox.Show("ERROR:" + ex.Message, "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Error); 

     } 
     } 
     } 
     } 
     } 

問題は、私はSaveRecord();機能]ダイアログボックスで、それに直面しています。

if (s.ShowDialog() == DialogResult.OK) //Here is error 
     { 
     try 
     { 
     qrimage.Image.Save(s.FileName); 
     } 

Answer 1

ダイアログが