Part - 2
Using Fields with
GridView Control
As to solve some of problems like enabling the GridView to render its
columns automatically is that we give up any control over column formatting.
For example, the BoxOfficeTotals column is displayed as a decimal amount
without any currency formatting. The EnTRyDate column always displays in
short-date and long-time format. The solution to such problems is to specify
explicitly the fields that a GridView displays. The GridView control
supports the following types of fields:
-
BoundField
Enables us to display the value of a data item as text.
-
CheckBoxField
Enables us to display the value of a data item as a check box.
-
CommandField
Enables us to display links for editing, deleting, and selecting rows.
-
ButtonField
Enables us to display the value of a data item as a button (image
button, link button, or push button).
-
HyperLinkField
Enables us to display the value of a data item as a link.
-
ImageField
Enables us to display the valueof a data item as an image.
-
TemplateField
Enables us to customize the appearance of a data item.
Using BoundField
A BoundField always displays the value of a data item as text when a row is
in normal display mode. When a row is selected for editing, a BoundField
displays the value of a data item in a single line text field. The most
important three properties of the BoundField class are the DataField,
DataFormatString, and HeaderText properties.
![GridView1.gif]()
<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD
XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<div>
<asp:GridView ID="GridView1"
runat="server"
AutoGenerateColumns="False"
DataSourceID="SqlDataSource1"
EmptyDataText="There
are no data records to display."
Width="495px">
<Columns>
<asp:BoundField
DataField="ID"
HeaderText="Serial
Number"
SortExpression="ID"/>
<asp:BoundField
DataField="NAME"
HeaderText="Name
of Candidate"
SortExpression="NAME" />
<asp:BoundField
DataField="ADDRESS"
HeaderText="Address
of Candidate"
SortExpression="ADDRESS" />
<asp:BoundField
DataField="MOBILE"
HeaderText="MOBILE"
SortExpression="MOBILE" />
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:DatabaseConnectionString1 %>"
ProviderName="<%$ ConnectionStrings:DatabaseConnectionString1.ProviderName %>"
SelectCommand="SELECT
[ID], [NAME], [ADDRESS], [MOBILE] FROM [MYTB]">
</asp:SqlDataSource>
</div>
</div>
</form>
</body>
</html>
Notice that the GridView control includes an AutoGenerateColumns property
that is assigned the value False. If we don't disable automatically
generated columns, then both columns represented by the BoundFields and all
the columns from the data source are displayed redundantly. BoundFields also
supports several useful properties as listed below.
-
AccessibleHeaderText Enables we to add an HTML abbr attribute to the
column header.
-
ApplyFormatInEditMode Enables us to apply the DataFormatString to the
field when the row is in edit display mode.
-
ConvertEmptyStringToNull Enables we to convert an empty string "" into
the value Nothing (null) when editing a column.
-
DataField
Enables we to specify the name of the field that the BoundField
displays.
-
DataFormatString Enables we to use a format string to format a data
item.
-
FooterStyle
Enables we to format the column footer.
-
FooterText
Enables we to display text in the column footer.
-
HeaderImageUrl
Enables we to display an image in the column header.
-
HeaderStyle
Enables we to format the column header.
-
HeaderText
Enables we to display text in the column header.
-
HtmlEncode
Enables we to HTML-encode the value of a data item, which enables you to
avoid script injection attacks.
-
InsertVisible
Enables we to not display a column when inserting a new record (does not
apply to the GridView control).
-
ItemStyle
Enables we to format a data item.
-
NullDisplayText
Enables we to specify textthat is displayed when a data item has the
value Nothing (null).
-
ReadOnly
Enables we to prevent the data item from being edited in edit mode.
-
ShowHeader
Enables we to display the column header.
-
SortExpression
Enables we to associate a sort expression with the column.
-
Visible Enables
we to hide a column.
Note: Continue
in Next Part.
HAVE A GREAT CODING!