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After you enter details of a new employee to be added and click the Insert button, a new row is added to the underlying DataTable. The code that makes it possible is shown in Listing 7-6. Listing 7-6. Adding a New DataRow private void button2_Click(object sender, EventArgs e) { DataRow row = ds.Tables["Employees"].NewRow(); row["employeeid"] = comboBox1.Text; row["firstname"] = textBox1.Text; row["lastname"] = textBox2.Text; row["homephone"] = textBox3.Text; row["notes"] = textBox4.Text; ds.Tables["Employees"].Rows.Add(row); FillEmployees(); } The code creates a new DataRow by calling the NewRow() method on the Employees DataTable. The NewRow() method creates a new stand-alone row in memory, matching the schema of the underlying DataTable. Then various column values of the DataRow are assigned. The newly created row is not yet part of the DataTable, so to add it to the DataTable, the Add() method of the Rows collection is called. Finally, the combo box is repopulated so as to display the newly added employee ID. asp.net pdf 417 ASP . NET PDF-417 Barcode Generator - Generate 2D PDF417 in ...
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Easy-to-use ASP . NET PDF417 Barcode Component, generating PDF-417 barcode images in ASP.NET, C#, VB.NET, and IIS project. Note If it helps, consider the latter part of the scp command after the filename as one large address: first you provide your username, then the computer address, and then the path. asp.net pdf 417 PDF417 ASP . NET - Barcode Tools
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2 May 2019 ... NET framework. It is the second article published by this author on encoding and decoding of PDF417 barcodes. The first article is PDF417 ... Using the command when you are logged in to another computer via ssh works in exactly the same way. Let s consider an example: Assume there are two computers: A and B. You have a user account on each one. So sitting at the keyboard of A, you establish an ssh connection with B by typing the following: ssh <username>@computer_B This lets you log in to B as if you were sitting in front of it. You spot a file called spreadsheet.xls that you want to copy to your local machine (A). You therefore issue the following command: scp spreadsheet.xls <username>@computer_A:/home/username/ This will copy the file from computer B to computer A and place it in the /home/username/ directory. asp.net pdf 417 ASP . NET Barcode Demo - PDF417 Standard - Demos - Telerik
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It can work with Code128, PDF417 and many other symbologies. ... annoyingly split it along technology lines ( Barcode Professional "...for ASP . Private Sub ExecuteCommand(ByVal commandText As String) Dim commandResult As Integer cmd.CommandText = commandText Console.WriteLine("Executing command:") Console.WriteLine(cmd.CommandText) commandResult = cmd.ExecuteNonQuery() Console.WriteLine("ExecuteNonQuery returns {0}.", commandResult) End Sub Private Sub PrepareInsertTextFile() cmd.CommandText = "" & ControlChars.CrLf & _ "insert into texttable" & ControlChars.CrLf & _ "values (@textfile, @textdata)" & ControlChars.CrLf cmd.Parameters.Add("@textfile", SqlDbType.NVarChar, 30) cmd.Parameters.Add("@textdata", SqlDbType.Text, 1000000) End Sub Private Sub ExecuteInsertTextFile(ByVal textFile As String) Dim textData As String = GetTextFile(textFile) cmd.Parameters("@textfile").Value = textFile cmd.Parameters("@textdata").Value = textData ExecuteCommand(cmd.CommandText) End Sub Private Function GetTextFile(ByVal textFile As String) As String Dim textBytes As String = Nothing Console.WriteLine("Loading File: " & textFile) Dim fs As New FileStream(textFile, FileMode.Open, FileAccess.Read) Dim sr As New StreamReader(fs) textBytes = sr.ReadToEnd() Console.WriteLine("TextBytes has length {0} bytes.", textBytes.Length) Return textBytes End Function End Class End Namespace 3. Make LoadText the startup project, and run it by pressing Ctrl+F5. You should see the results in Figure 18-5. To update an existing row, you must find it first and then update the column values. To find a specific row, you can use the same Select() method that we used earlier. This is shown in Listing 7-7. Listing 7-7. Updating a DataRow private void button1_Click(object sender, EventArgs e) { if (comboBox1.SelectedItem == null) { MessageBox.Show("Please select Employee ID!"); return; } string id = comboBox1.SelectedItem.ToString(); DataRow[] rows = ds.Tables["Employees"].Select("EmployeeID=" + id); rows[0].BeginEdit(); rows[0]["firstname"] = textBox1.Text; rows[0]["lastname"] = textBox2.Text; rows[0]["homephone"] = textBox3.Text; rows[0]["notes"] = textBox4.Text; rows[0].EndEdit(); } The code selects the employee record that is to be updated by using the Select() method of the DataTable. The BeginEdit() method of the DataRow class takes the row in edit mode. The column values are then assigned. Finally, the EndEdit() method of the DataRow class is called. This saves the changes to the underlying DataTable. Tip With scp, you can copy entire directories too. Simply add the -r command option, like so: scp -r mydirectory <username>@<IP address>:/path/. To copy a lot of files to or from a remote computer, the sftp program is the best solution, because it uses the same secure connection already described. If you ve ever used a shell-based FTP program, you ll feel right at home, because sftp isn t very different. To delete a row, you must locate it first and then call the Delete() method on it. This is illustrated in Listing 7-8. Listing 7-8. Deleting a DataRow private void button3_Click(object sender, EventArgs e) { if (comboBox1.SelectedItem == null) { MessageBox.Show("Please select Employee ID!"); return; } string id = comboBox1.SelectedItem.ToString(); DataRow[] rows = ds.Tables["Employees"].Select("EmployeeID=" + id); rows[0].Delete(); FillEmployees(); } asp.net pdf 417 Create PDF 417 barcode in asp . net WEB Application | DaniWeb
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