Example E4505
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WinForms Data Grid - Implement CRUD operations (XPInstantFeedbackSource)

In this example the WinForms Data Grid control is bound to an XPInstantFeedbackSource to display data from the standard SQL Northwind database. The example demonstrates how to create a custom edit form to allow users to create, update, and delete data rows/records.

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Example Code

DXServermode2/Form1.cs(vb)
C#
// Developer Express Code Central Example: // How to implement CRUD operations using XtraGrid and XPInstantFeedbackSource // // This example demonstrates how to implement the Create, Update and Delete // operations using XPInstantFeedbackSource. // This example works with the standard // SQL Northwind database. // // You can find sample updates and versions for different programming languages here: // http://www.devexpress.com/example=E4505 using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using DevExpress.Skins; using DevExpress.LookAndFeel; using DevExpress.UserSkins; using DevExpress.XtraEditors; using DevExpress.Xpo; using DevExpress.Xpo.DB; namespace XPInstantFeedback { public partial class Form1 : XtraForm { public Form1() { InitializeComponent(); gridView1.AsyncCompleted += new EventHandler(gridView1_AsyncCompleted); gridView1.OptionsView.WaitAnimationOptions = WaitAnimationOptions.Panel; gridControl.DataSource = xpInstantFeedbackSource1; } Customers customerToEdit; EditForm f1; private int oldRowsCount; void gridView1_AsyncCompleted(object sender, EventArgs e) { if (customerToEdit != null && gridView1.DataRowCount > oldRowsCount) { for (int i = 0; i < gridView1.DataRowCount; i++) { if (customerToEdit.CustomerID == gridView1.GetRowCellValue(i, gridView1.Columns["CustomerID"]).ToString()) { gridView1.FocusedRowHandle = i; oldRowsCount = gridView1.DataRowCount; customerToEdit = null; break; } } } } private void xpInstantFeedbackSource1_DismissSession(object sender, ResolveSessionEventArgs e) { IDisposable session1 = e.Session as IDisposable; if (session1 != null) { session1.Dispose(); } } private void xpInstantFeedbackSource1_ResolveSession(object sender, ResolveSessionEventArgs e) { session1 = new Session() { ConnectionString = MSSqlConnectionProvider.GetConnectionString("(local)", "NorthWind") }; session1.Connect(); e.Session = session1; } private void button1_Click(object sender, EventArgs e) { session1.BeginTrackingChanges(); oldRowsCount = gridView1.DataRowCount; customerToEdit = CreateCustomer(); EditCustomer(customerToEdit, "NewCustomer", CloseNewCustomerHandler); } private Customers CreateCustomer() { string idString; var newCustomer = new Customers(session1); while (true) { idString = GenerateCustomerID(); if (!String.IsNullOrEmpty(idString)) { newCustomer.CustomerID = idString; break; } } return newCustomer; } private string GenerateCustomerID() { const int IDLength = 5; var result = String.Empty; var rnd = new Random(); bool collisionFlag = false; for (var i = 0; i < IDLength; i++) { result += Convert.ToChar(rnd.Next(65, 90)); } for (int i = 0; i <gridView1.DataRowCount; i++) { if (result == gridView1.GetRowCellValue(i, gridView1.Columns["CustomerID"]).ToString()) { collisionFlag = true; break; } } if (collisionFlag) { return String.Empty; } else return result; } private void button2_Click(object sender, EventArgs e) { session1.BeginTrackingChanges(); string key = GetCustomerIDByRowHandle(gridView1.FocusedRowHandle); customerToEdit = session1.GetObjectByKey(typeof(Customers), key) as Customers; EditCustomer(customerToEdit, "EditInfo", CloseEditCustomerHandler); } private void EditCustomer(Customers customer, string windowTitle, FormClosingEventHandler closedDelegate) { f1 = new EditForm(customer) { Text = windowTitle }; f1.FormClosing += closedDelegate; f1.ShowDialog(); } private string GetCustomerIDByRowHandle(int rowHandle) { return (string)gridView1.GetRowCellValue(rowHandle, "CustomerID"); } private void CloseEditCustomerHandler(object sender, EventArgs e) { if (((EditForm)sender).DialogResult == DialogResult.OK) { try { customerToEdit.Save(); session1.CommitTransaction(); xpInstantFeedbackSource1.Refresh(); } catch (Exception ex) { HandleExcepton(ex); } } customerToEdit = null; } private void CloseNewCustomerHandler(object sender, FormClosingEventArgs e) { if (((EditForm)sender).DialogResult == DialogResult.OK) { try { customerToEdit.Save(); session1.CommitTransaction(); xpInstantFeedbackSource1.Refresh(); } catch (Exception ex) { HandleExcepton(ex); } for (int i = 0; i < gridView1.DataRowCount; i++) { if (customerToEdit.CustomerID == gridView1.GetRowCellValue(i, gridView1.Columns["CustomerID"]).ToString()) { gridView1.FocusedRowHandle = i; break; } } } } private void HandleExcepton(Exception ex) { MessageBox.Show(ex.Message); } private void button3_Click(object sender, EventArgs e) { session1.BeginTrackingChanges(); DeleteCustomer(gridView1.FocusedRowHandle); } private void DeleteCustomer(int focusedRowHandle) { if (focusedRowHandle < 0) return; if (MessageBox.Show("Do you really want to delete the selected customer?", "Delete Customer", MessageBoxButtons.OKCancel) != DialogResult.OK) { return; } Customers victim = session1.GetObjectByKey(typeof(Customers), GetCustomerIDByRowHandle(gridView1.FocusedRowHandle)) as Customers; try { if (victim != null) { victim.Delete(); session1.CommitTransaction(); xpInstantFeedbackSource1.Refresh(); } } catch (Exception ex) { HandleExcepton(ex); } gridView1.FocusedRowHandle = focusedRowHandle; customerToEdit = null; } } }
DXServermode2/EditForm.cs(vb)
C#
// Developer Express Code Central Example: // How to implement CRUD operations using XtraGrid and XPInstantFeedbackSource // // This example demonstrates how to implement the Create, Update and Delete // operations using XPInstantFeedbackSource. // This example works with the standard // SQL Northwind database. // // You can find sample updates and versions for different programming languages here: // http://www.devexpress.com/example=E4505 using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using DevExpress.XtraEditors; namespace XPInstantFeedback { public partial class EditForm : DevExpress.XtraEditors.XtraForm { public EditForm(Customers customer) { InitializeComponent(); textEdit4.DataBindings.Add("EditValue", customer, "CompanyName"); textEdit3.DataBindings.Add("EditValue", customer, "ContactName"); textEdit2.DataBindings.Add("EditValue", customer, "Address"); textEdit1.DataBindings.Add("EditValue", customer, "Country"); } private void simpleButton1_Click(object sender, EventArgs e) { DialogResult = System.Windows.Forms.DialogResult.OK; } private void simpleButton2_Click(object sender, EventArgs e) { DialogResult = System.Windows.Forms.DialogResult.Cancel; } } }

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