vb.net 2008 barcode generator Figure 20-14 The DataGrid control in Visual C#.NET

Encoding GTIN - 12 in Visual C#.NET Figure 20-14 The DataGrid control

Figure 20-14 The DataGrid control
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20: Data in Windows Forms
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You can set two properties for the DataGrid control in order to have it display data The first property is the DataSource, which specifies the DataSet object that represents the retrieved data The second property is the DataMember, which can be used to specify the single table relationship If a DataSource represents a DataSet created by combining multiple tables, the DataMember must specify the table to which the DataGrid is bound EXAM TIP Be sure to know the difference between the DataSource and DataMember properties There are a few important characteristics of a DataGrid control that you should know about The first is that in order to format the display of data in a manner other than the default display shown in Figure 20-14, you need to work with the properties of the DataGrid, such as GridLineStyle, which can be set to Solid (the default) or None This can be done programmatically by creating a DataGridTableStyle object and setting its properties to the display you need:
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DataGridTableStyle myStyle = new DataGridTableStyle(); myStyleGridLineStyle = DataGridLineStyelNone;
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PART III
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You can set the column style by using the DataGrid properties, or programmatically by using a DataGridTextBoxColumn object:
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DataGridTextBoxColumn myColumns = new DataGridTextBoxColumn(); myColumnsWidth = 100;
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You can also set properties such as Width, Alignment, HeaderText, and so on Once the desired properties have been set, you can then add the DataGridTextBoxColumn to the GridColumnStyles collection as follows:
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myStyleGridColumnStylesAdd (myColumns);
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Finally, you ll need to add the table style to the data grid:
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dataGrid1TableStylesAdd (myStyle);
You can also use the AutoFormat tool to select a preset format for your DataGrid Right-click on the DataGrid on your form, and select AutoFormat Figure 20-15 shows the Auto Format dialog box that appears The DataGrid control can also be used to show the relationship between two related tables Here s what you would do: 1 Create a DataSet that represents the related tables 2 Add a DataControl for each related table to your form 3 Create a DataRelation object that will represent the relationship between the tables Tie the tables together by setting the relationship properties (table, column, and so on)
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Figure 20-15 The Auto Format dialog box
4 Using the DataSet object s Relation collection, add the DataRelation 5 Bind the grids to the DataSet (use the SetDataBinding() method of the DataGrid) If you wish to experiment with this process using the DataGrid, follow the preceding steps We will explore table relationships later in this chapter, and we ll look at how to relate them programmatically
Loading the Data
If you have been following along and creating the sample application in this chapter, you are probably disappointed that your data does not show on the form as it did in Figure 20-14 This is because you still have to manually load the data This may be new to you (particularly if you have programmed under any earlier ADO object models) ADONET does not assume that there is a full-time connection to the data store In order to retrieve your data, you must manually load the data into the DataSet EXAM TIP To manually load data, you use the Fill() method of the DataAdapter To produce the output that you saw in Figure 20-14 you need to load the data into the DataSet by using the DataAdapter Where in the application you do this is an important consideration You don t want to do it too early, because you will be wasting resources before they are actually needed, and you don t want to do it too late, because the process may take some time Take time to determine the appropriate time to access the actual data For the purpose of demonstration only, we will add the following code to the load event of the form:
private void Form1_Load(object sender, SystemEventArgs e) { sqlDataAdapter1Fill(dsStudent1); }
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