C# Tutorial MSM_Murach chapter-19-slides

Murach’s C# 2010, C19 © 2010, Mike Murach & Associates, Inc. Slide 1

Chapter 19

How to work with bound controls and

parameterized queries


Objectives Applied 1. Format the data in a bound text box by setting the properties for

the control. 2. Bind a combo box to a data source. 3. Use the properties and methods of the BindingSource class to

navigate and modify the rows in a dataset. 4. Create and use a parameterized query with a data source. 5. Customize a ToolStrip control by adding controls to it, deleting

controls from it, and formatting the controls that are on it. Then, code the event handlers for making these controls work.

6. Customize the appearance and operation of a DataGridView control.

7. Use a DataGridView control as part of a Master/Detail form.


Objectives (continued) Knowledge 1. Explain why you might want to use code to work directly with the

binding source object for a data source. 2. Describe the use of a parameterized query and the ToolStrip

control that gets generated for the query.


The dialog box for formatting a column


A combo box that’s bound to a data source


Combo box properties for binding DataSource DisplayMember ValueMember SelectedValue


Common properties of the BindingSource class Position Count


Common methods of the BindingSource class AddNew() EndEdit() CancelEdit() RemoveCurrent() MoveFirst() MovePrevious() MoveNext() MoveLast()


A statement that adds a new row to a data source this.customersBindingSource.AddNew();

A statement that saves the changes to the current row and ends the edit

this.customersBindingSource.EndEdit();

A statement that cancels the changes to the current row

this.customersBindingSource.CancelEdit();

A statement that removes the current row from a data source

this.customersBindingSource.RemoveCurrent();


Code that moves to the next row and displays the position and count

private void btnNext_Click(object sender, EventArgs e) { this.customersBindingSource.MoveNext(); int position = customersBindingSource.Position + 1; txtPosition.Text = position + " of " + customersBindingSource.Count; }


The dialog box for creating a parameterized query


The Customer Maintenance form with a toolbar


The generated code for a parameterized query private void fillByCustomerIDToolStripButton_Click( object sender, EventArgs e) { try { this.customersTableAdapter.FillByCustomerID( this.mmaBooksDataSet.Customers, ((int)(System.Convert.ChangeType( customerIDToolStripTextBox.Text, typeof(int))))); } catch (System.Exception ex) { System.Windows.Forms.MessageBox.Show(ex.Message); } }


The same code after it has been improved private void fillByCustomerIDToolStripButton_Click( object sender, EventArgs e) { try { int customerID = Convert.ToInt32( customerIDToolStripTextBox.Text); this.customersTableAdapter.FillByCustomerID( this.mmaBooksDataSet.Customers, customerID); } catch (Exception ex) { MessageBox.Show(ex.Message, ex.GetType().ToString()); } }


The syntax of the method for filling a table with a parameterized query

tableAdapter.QueryName(dataSet.TableName, param1 [,param2]...)


The Items Collection Editor for a ToolStrip control


Common properties of ToolStrip items DisplayStyle Image Text Width


Customized toolbars

The event handler for the Cancel ToolStrip button private void bindingNavigatorCancelItem_Click( object sender, EventArgs e) { this.customersBindingSource.CancelEdit(); }


The event handler for the Get All Customers ToolStrip button

private void fillToolStripButton_Click( object sender, EventArgs e) { try { this.customersTableAdapter.Fill( this.mmaBooksDataSet.Customers); } catch (SqlException ex) { MessageBox.Show("Database error # " + ex.Number + ": " + ex.Message, ex.GetType().ToString()); } }


The event handler for the Get Customer ToolStrip button private void fillByCustomerIDToolStripButton_Click( object sender, EventArgs e) { try { int customerID = Convert.ToInt32( customerIDToolStripTextBox.Text); this.customersTableAdapter.FillByCustomerID( this.mmaBooksDataSet.Customers, customerID); if (customersBindingSource.Count == 0) MessageBox.Show("No customer with this ID. " + "Please try again.", "Customer Not Found"); } catch (FormatException) { MessageBox.Show("Customer ID must be an integer.", "Entry Error"); }


The event handler for the Get Customer ToolStrip button (cont.) catch (SqlException ex) { MessageBox.Show("Database error # " + ex.Number + ": " + ex.Message, ex.GetType().ToString()); } }


The form for the Customer Maintenance application


The Customer Maintenance application private void Form1_Load(object sender, EventArgs e) { try { this.statesTableAdapter.Fill( this.mmaBooksDataSet.States); stateComboBox.SelectedIndex = -1; } catch (SqlException ex) { MessageBox.Show("Database error # " + ex.Number + ": " + ex.Message, ex.GetType().ToString()); } }


The Customer Maintenance application (cont.) private void fillByCustomerIDToolStripButton_Click( object sender, EventArgs e) { try { int customerID = Convert.ToInt32( customerIDToolStripTextBox.Text); this.customersTableAdapter.FillByCustomerID( this.mmaBooksDataSet.Customers, customerID); if (customersBindingSource.Count == 0) MessageBox.Show("No customer with this ID. " + "Please try again.", "Customer Not Found"); }


The Customer Maintenance application (cont.) catch (FormatException) { MessageBox.Show( "Customer ID must be an integer.", "Entry Error"); } catch (SqlException ex) { MessageBox.Show("Database error # " + ex.Number + ": " + ex.Message, ex.GetType().ToString()); } } private void bindingNavigatorCancelItem_Click( object sender, EventArgs e) { this.customersBindingSource.CancelEdit(); }


The Customer Maintenance application (cont.) private void customersBindingNavigatorSaveItem_Click( object sender, EventArgs e) { if (customersBindingSource.Count > 0) { if (IsValidData()) { try { this.customersBindingSource.EndEdit(); this.tableAdapterManager.UpdateAll( this.mmaBooksDataSet); }


The Customer Maintenance application (cont.) catch (ArgumentException ex) { MessageBox.Show(ex.Message, "Argument Exception"); customersBindingSource.CancelEdit(); } catch (DBConcurrencyException) { MessageBox.Show( "A concurrency error occurred. " + "Some rows were not updated.", "Concurrency Exception"); this.customersTableAdapter.Fill( this.mmaBooksDataSet.Customers); }


The Customer Maintenance application (cont.) catch (DataException ex) { MessageBox.Show(ex.Message, ex.GetType().ToString()); customersBindingSource.CancelEdit(); } catch (SqlException ex) { MessageBox.Show("Database error # " + ex.Number + ": " + ex.Message, ex.GetType().ToString()); } } }


The Customer Maintenance application (cont.) else { try { this.tableAdapterManager.UpdateAll( this.mmaBooksDataSet); } catch (DBConcurrencyException) { MessageBox.Show("A concurrency error occurred. " + "Some rows were not updated.", "Concurrency Exception"); this.customersTableAdapter.Fill( this.mmaBooksDataSet.Customers); } catch (SqlException ex) { MessageBox.Show("Database error # " + ex.Number + ": " + ex.Message, ex.GetType().ToString()); } } }


The Customer Maintenance application (cont.) public bool IsValidData() { return IsPresent(nameTextBox, "Name") && IsPresent(addressTextBox, "Address") && IsPresent(cityTextBox, "City") && IsPresent(stateComboBox, "State") && IsPresent(zipCodeTextBox, "Zip code"); }


The Customer Maintenance application (cont.) public bool IsPresent(Control control, string name) { if (control.GetType().ToString() == "System.Windows.Forms.TextBox") { TextBox textBox = (TextBox)control; if (textBox.Text == "") { MessageBox.Show( name + " is a required field.", "Entry Error"); textBox.Focus(); return false; } }


The Customer Maintenance application (cont.) else if (control.GetType().ToString() == "System.Windows.Forms.ComboBox") { ComboBox comboBox = (ComboBox)control; if (comboBox.SelectedIndex == -1) { MessageBox.Show( name + " is a required field.", "Entry Error"); comboBox.Focus(); return false; } } return true; }


The Customer Maintenance application (cont.) private void fillToolStripButton_Click( object sender, EventArgs e) { try { this.customersTableAdapter.Fill( this.mmaBooksDataSet.Customers); } catch (SqlException ex) { MessageBox.Show("Database error # " + ex.Number + ": " + ex.Message, ex.GetType().ToString()); } }


The smart tag menu for a DataGridView control


The dialog box for editing DataGridView columns


Common properties of a column HeaderText Width DefaultCellStyle ReadOnly SortMode


To format columns: The CellStyle Builder dialog box


To format columns: The Format String dialog box


A form that uses a DataGridView control


Two BindingSource properties for displaying data from a related table DataSource DataMember

The property settings for the invoicesBindingSource object Property Setting DataSource customersBindingSource DataMember FK_Invoices_Customers


The Customer Invoices form


The dataset schema


The code for the Customer Invoices form private void fillByCustomerIDToolStripButton_Click( object sender, EventArgs e) { try { int customerID = Convert.ToInt32( customerIDToolStripTextBox.Text); this.customersTableAdapter.FillByCustomerID( this.mmaBooksDataSet.Customers, customerID); if (customersBindingSource.Count > 0) this.invoicesTableAdapter.FillByCustomerID( this.mmaBooksDataSet.Invoices, customerID); else MessageBox.Show("No customer with this ID. " + "Please try again.", "Customer Not Found"); }


The code for the Customer Invoices form (cont.) catch (FormatException) { MessageBox.Show("Customer ID must be an integer.", "Entry Error"); } catch (SqlException ex) { MessageBox.Show("Database error # " + ex.Number + ": " + ex.Message, ex.GetType().ToString()); } }

C# Tutorial MSM_Murach chapter-19-slides

Technology

Transcript of C# Tutorial MSM_Murach chapter-19-slides