C# WINDOWS FORMS - COMBOBOX - YouTube
C# WINDOWS FORMS - COMBOBOX - YouTube | windows forms combobox

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Using the DataTable object, you can use addition article alleged the DataRow article that allows you to locate a specific row in the data table. This is advantageous back you appetite to present your users with a search apparatus for your form. This How-To shows you how to locate a specific row aural your abstracts table and how to use the aforementioned abstracts table for two different purposes.

C# WINDOWS FORMS - COMBOBOX - YouTube - windows forms combobox
C# WINDOWS FORMS – COMBOBOX – YouTube – windows forms combobox | windows forms combobox

After you accept your DataTable article loaded in memory, you appetite to be able to locate specific annal aural the DataTable object. How do you locate annal in the DataTable object?

For this How-To, you are activity to use a ComboBox ascendancy instead of a ListBox control. You will use the aforementioned address for loading the admixture box as you would the account box. The change comes back you baddest an account from the combo box.

When an account is alleged in the admixture box, the SelectedIndexChanged accident is accursed off. Aural this event, you will booty the admixture box’s SelectedItem, which gives the ValueMember that is amid in the alleged row, and use that with the Acquisition adjustment off the DataTables Rows collection.

With the abstracts row located, the agnate columns are loaded into argument boxes on the form, as apparent in Figure 3.4.

Figure 3.4 This admixture box will point the user to a specific customer.

Open and run the VB.NET—Chapter 3 solution. From the capital form, bang on the command on with the explanation How-To 3.3. Back the anatomy loads, aces a new chump from the account that is presented in the chump ComboBox control. You will see the argument boxes beneath the ComboBox ascendancy display new abstracts that corresponds to the alleged customer.

Create a new Windows Form.

Add some labels, admixture boxes, and argument boxes, as listed in Table 3.4.

Object

Property

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Setting

Label

Name

Label1

Caption

Customer

ComboBox

Name

cboCustomers

Label

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Name

Label2

Caption

Customer ID

Label

Name

Label3

Caption

Company Name

Label

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FoxLearn | Windows Forms: Search DataGridView by using ComboBox and .. | windows forms combobox

Name

Label4

Caption

Address

Label

Name

Label5

Caption

City

TextBox

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Name

txtCustomerID

TextBox

Name

txtCompanyName

TextBox

Name

txtAddress

TextBox

Name

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txtCity

You will additionally appetite to accomplish abiding that the Argument backdrop in the TextBox controls are blank.

In the chic bore for the form, add the afterward two Private declarations aloof beneath the band of cipher that reads Windows Anatomy Designer generated code.

These curve of cipher acknowledge a abstracts adapter and a abstracts table that will be acclimated throughout the form.

NOTE

Adding the m on the advanced tells you that it is a module- or member-level variable.

Also, bethink that although you are declaring this at the anatomy level, the affiliation that is acclimated for the abstracts adapter is not activity to be larboard accessible the accomplished time the anatomy is. Back the abstracts table is filled, the affiliation is opened. Again the abstracts is accessed locally application XML beneath the covers. It is disconnected from the server.

The PrimaryKey acreage that was set will be acclimated in the cipher for the aing footfall by the Acquisition adjustment of mdtCust’s Rows collection.

This aftermost bit of cipher needs to be added to the SelectedIndexChanged accident of the cboCustomers ComboBox control. As with the aftermost step, back a abstracts cavalcade was set up for the PrimaryKey property, in this footfall an arrangement is defined to canyon the SelectedItem amount to acquisition the Acquisition method. The argument boxes’ Argument backdrop are again set to the cavalcade ethics by application the ToString method.

When a user picks a chump from the cboCustomer ComboBox control, the cipher again locates the adapted amount aural the mdtCust data Table application the Acquisition adjustment off the rows collection. Argument boxes are again loaded from the row that is retrieved.

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Locating annal aural a abstracts table and abstracts row is appealing accessible when you’re application the methods that are supplied. ADO.NET provides the control you need, not alone at the all-embracing hierarchical level, but additionally at the row and cavalcade levels.

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Change ComboBox to DropdownList and vice versa in Windows forms ..
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