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Monday, October 21, 2013
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Example of FindByValue method in ASP.NET

2:45 AMMonday, October 21, 2013

Introduction

Searches the collection for a ListItem with a Value property that contains the specified value (According to msdn library).
Lets take an simple example to remove item from DropdownList using FindByValue method. Basically this method works on collection.
Algorithm behind the scene is
Step-1 : Bind DropdownList with some values
Step-2 : Drop TextBox and Button control to the design page.
Step-3:  First check the capacity of the DropdownList is more than 0 . if capacity is more than 0 then remove the item from the list using FindByValue( ) method.
Step-4: End Program.

Complete code of the program is

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    protected void Button1_Click(object sender, EventArgs e)
    {
        string item = TextBox1.Text;
        if (DropDownList1 .Items .Capacity >0)
        {
            DropDownList1.Items.Remove(DropDownList1.Items.FindByValue(item));
        }
       
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:DropDownList ID="DropDownList1" runat="server" Height="20px" Width="124px">
            <asp:ListItem>Hyperlink</asp:ListItem>
            <asp:ListItem>CheckBox</asp:ListItem>
            <asp:ListItem>Label</asp:ListItem>
            <asp:ListItem>Panel</asp:ListItem>
        </asp:DropDownList>
        <br />
        <br />
        Item to be removed from Dropdownlist:<br />
        <asp:TextBox ID="TextBox1" runat="server" Width="186px"></asp:TextBox>
        <br />
        <br />
        <asp:Button ID="Button1" runat="server" Text="Remove Item "
            onclick="Button1_Click" />
        <br />
        <br />
    </div>
    </form>
</body>

</html>
Output
Bind DropdownList in asp.net

Remove item from dropdownlist using textbox value

Remove item from FindByValue method

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