Query string is used to pass the values or information form one page to another page. It is part of State Management
You want to see how to use the QueryString collection in the ASP.NET web development framework. Almost all examples show one way of using this NameValueCollection, but there are faster and more logical ways. This short information sheet has some examples and tips withQueryString, using the C# programming language.
The query string is composed of a series of field – value pair. Below is the pattern of query string
field1=value1&field2=value2&field3=value3
An URL that contains query string can be depicted as follow:
http://www.domainname.com?field1=value1&field2=value2&field3=value3
Retrieving Query Strings in ASP.NET
Retrieving query strings in ASP.NET is quite simple, what we need is just the following line of code: Page.Request.QueryString[queryStringField];
or Page.Request.QueryString[indexOfQueryString];
Retrieving query strings in ASP.NET is quite simple, what we need is just the following line of code: Page.Request.QueryString[queryStringField];
or Page.Request.QueryString[indexOfQueryString];
Just do this inside of your ASP.NET code: Page.Request.QueryString["FName"] orPage.Request.QueryString[0]
Let’s look at how it work in simple source of code
Often you need to pass variable content between one aspx page to other aspx web page. Forexample in first page you collect information about your First And Last Name (Default.aspx), use this information in your second page(Default2.aspx).
HTML
Default.aspx
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>QueryString Exampletitle>
</head>
<body>
<form id="form1" runat="server">
<div>
<div style="float: left; width: 100%"><div style="float: left; width: 100%"><div style="float: left; width: 20%">First Name :</div><div style="float: right; width: 78%"><asp:TextBox ID="TextBox1" runat="server">asp:TextBox></div></div><div style="float: left; width: 100%"><div style="float: left; width: 20s%">Last Name :</div><div style="float: right; width: 78%"><asp:TextBox ID="TextBox2" runat="server">asp:TextBox></div></div>
<div style="float: left; width: 100%"><asp:Button ID="Button1" runat="server" Text="Submit" onclick="Button1_Click" /></div>
</div>
</div>
</form>
</body>
</html>
Code Behind Default.aspx
protected void Button1_Click(object sender, EventArgs e)
{
Server.Transfer("Default2.aspx?FName="+TextBox1.Text+"&LName="+TextBox2.Text);
}
Default2.aspx
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="Label1" runat="server" Text="Label">asp:Label>
</div>
</form>
</body>
</html>
Default2.aspx Code Behind
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack){Label1.Text = "First Name : " + Request.QueryString["FName"].ToString()+ "Last Name : " + Request.QueryString["LName"].ToString();}
}
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