Copying and Pasting cs Code

In cs, like in almost any computer programming language, reading data from a file can be tricky. You add extra lines of code to tell the computer what to do. Sometimes you can copy and paste these lines from other peoples’ code.

For example, you can follow the pattern in this listing:

         private void Button1_Click(object sender, EventArgs e)
         {
             try
             {
                 int RowsAffected = 0;
                 if ((txtUserName.Text.Trim().Length == 0))
                 {
                     MessageBox.Show("Please enter user name", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                     txtUserName.Focus();
                     return;
                 }
                 if ((txtOldPassword.Text.Trim().Length == 0))
                 {
                     MessageBox.Show("Please enter old password", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                     txtOldPassword.Focus();
                     return;
                 }
                 if ((txtNewPassword.Text.Trim().Length == 0))
                 {
                     MessageBox.Show("Please enter new password", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                     txtNewPassword.Focus();
                     return;
                 }
                 if ((txtConfirmPassword.Text.Trim().Length == 0))
                 {
                     MessageBox.Show("Please confirm new password", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                     txtConfirmPassword.Focus();
                     return;
                 }
                 if ((txtNewPassword.TextLength < 5))
                 {
                     MessageBox.Show("The New Password Should be of Atleast 5 Characters", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                     txtNewPassword.Text = "";
                     txtConfirmPassword.Text = "";
                     txtNewPassword.Focus();
                     return;
                 }
                 else if ((txtNewPassword.Text != txtConfirmPassword.Text))
                 {
                     MessageBox.Show("Password do not match", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                     txtNewPassword.Text = "";
                     txtOldPassword.Text = "";
                     txtConfirmPassword.Text = "";
                     txtOldPassword.Focus();
                     return;
                 }
                 else if ((txtOldPassword.Text == txtNewPassword.Text))
                 {
                     MessageBox.Show("Password is same..Re-enter new password", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                     txtNewPassword.Text = "";
                     txtConfirmPassword.Text = "";
                     txtNewPassword.Focus();
                     return;
                 }

                 con = new SqlConnection(cs.DBConn);
                 con.Open();
                 string co = "Update Registration set Password = '" + txtNewPassword.Text + "'where UserName='" + txtUserName.Text + "' and Password = '" + txtOldPassword.Text + "'";

                 cmd = new SqlCommand(co);
                 cmd.Connection = con;
                 RowsAffected = cmd.ExecuteNonQuery();
                 if ((RowsAffected > 0))
                 {
                     MessageBox.Show("Successfully changed", "Password", MessageBoxButtons.OK, MessageBoxIcon.Information);
                     this.Hide();
                     txtUserName.Text = "";
                     txtNewPassword.Text = "";
                     txtOldPassword.Text = "";
                     txtConfirmPassword.Text = "";
                     frmLogin LoginForm1 = new frmLogin();
                     LoginForm1.Show();
                     LoginForm1.txtUserName.Text = "";
                     LoginForm1.txtPassword.Text = "";
                     LoginForm1.ProgressBar1.Visible = false;
                     LoginForm1.txtUserName.Focus();
                 }
                 else
                 {
                     MessageBox.Show("invalid user name or password", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                     txtUserName.Text = "";
                     txtNewPassword.Text = "";
                     txtOldPassword.Text = "";
                     txtConfirmPassword.Text = "";
                     txtUserName.Focus();
                 }
                 if ((con.State == ConnectionState.Open))
                 {
                     con.Close();
                 }
                 con.Close();
             }
             catch (Exception ex)
             {
                 MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
             }
         }