Introduction
In
Part 4 of this article series we have discussed how to Insert New Record
with FormView Control. Now in this article we will discuss how Delete Data or
say Record with FormView Control.
Deleting Data with FormView Control
We can use the FormView control to delete database records too. For example, the
page given below enables us to delete records from the BOOK_LIST database table.
![22.JPG]()
<%@
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
id="Head1"
runat="server">
<style
type="text/css">
html
{
background-color:silver;
}
#content
{
margin:auto;
width:600px;
padding:10px;
background-color:white;
font:14px
Georgia,Serif;
}
a
{
color:blue;
}
</style>
<title></title>
</head>
<body>
<form
id="form1"
runat="server">
<div
id="content">
<asp:FormView
id="frmBooks"
DataSourceID="SqlDataSource1"
DataKeyNames="ID"
AllowPaging="True"
Runat="server">
<ItemTemplate>
<b><u><%#
Eval("TITLE")%></u><b>
<br
/>
<b>Serial
Number:</b>
<%# Eval("ID")%>
<br
/>
<b>Author:</b>
<%# Eval("AUTHOR")%>
<br
/>
<b>Price:</b>
<%#Eval("PRICE")
%>
<hr
/>
<asp:LinkButton
id="lnkDelete"
Text="Delete
Book"
CommandName="Delete"
OnClientClick="return
confirm('Are you sure want to Delete?');"
Runat="server"
/>
</ItemTemplate>
</asp:FormView>
<asp:SqlDataSource
ID="SqlDataSource1"
runat="server"
ConnectionString="<%$
ConnectionStrings:DatabaseConnectionString1
%>"
ProviderName="<%$
ConnectionStrings:DatabaseConnectionString1.ProviderName
%>"
SelectCommand="SELECT
[ID], [TITLE], [AUTHOR], [PRICE] FROM [BOOK_LIST]"
DeleteCommand="DELETE
FROM BOOK_LIST WHERE ID=@ID">
</asp:SqlDataSource>
</div>
</form>
</body>
</html>
In above example, notice that the FormView control includes a DataKeyNames
property, which contains the name of the primary key column from the data
source. When deleting records with the FormView control, we need to indicate the
primary key column.
Furthermore, notice that the ItemTemplate includes a LinkButton for deleting a
record. The LinkButton looks like this:
<asp:LinkButton
id="lnkDelete"
Text="Delete
Book"
CommandName="Delete"
OnClientClick="return
confirm('Are you sure want to Delete?');"
Runat="server"
/>
This LinkButton includes a CommandName property that has the value Delete. When
we click the LinkButton, the SQL command represented by the SqlDataSource
control's DeleteCommand property is executed. The LinkButton includes an
OnClientClick property that calls the JavaScript confirm() method to display a
confirmation dialog box. This extra script prevents users from accidentally
deleting database records.
Note: This is my last article of this FormView Control series. I hope you
will enjoy it.
HAVE A GREAT CODING!