This article contains some Examples of Using Code Render Block In ASP.NET.
The following code shows an example to find the sum of two integers.
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="CodeRenderBlock.WebForm1" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<%
int a, b, sum;
a = 67;
b = 578;
sum = a + b;
%>
<h1>Sum of <%=a %> and <% =b %> is <% =sum %>.</h1>
</div>
</form>
</body>
</html>
Basically, here we are using the inline expressions also to display the value of variables a, b, and sum.
Output
The next example shows how to display the table of factorials. As can be seen, we use the nested loops in the following code. Also, the values of the number and its factorial are displayed using inline expressions.
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm2.aspx.cs" Inherits="CodeRenderBlock.WebForm2" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table border="2">
<tr>
<th>Number</th>
<th>Factorial</th>
</tr>
<%
int f = 1;
for(int i=1;i<=10;i++)
{ %>
<tr>
<td><% =i %></td>
<%
for(int j=1;j<=i;j++)
{
f = f * j;
}
%>
<td><% =f %></td>
</tr>
<%
f = 1;
}%>
</table>
</div>
</form>
</body>
</html>
Output
The following example shows how to find and display all prime numbers in the given range.
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm3.aspx.cs" Inherits="CodeRenderBlock.WebForm3" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h1>Prime Numbers in the Given Range
<%
int min_value, max_value;
min_value = 20;
max_value = 78;
bool prime = true;%>
<% =min_value %> to <% =max_value %></h1>
<%
for(int i=min_value;i<=max_value;i++)
{
for (int j = 2; j <= i / 2; j++)
{
if (i % j == 0)
{
prime = false;
break;
}
}
if(prime)
{ %>
<span style="font-size: 20px; color: #800000;"><% =i%> </span>
<%
}
prime = true;
}
%>
</div>
</form>
</body>
</html>
Output
Another example of using code render block is here. The following code shows how to display Fibonacci series up to a specific term.
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm4.aspx.cs" Inherits="CodeRenderBlock.WebForm4" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h1> Fibonacci Series Up to the number
<% int n = 120; %>
<% =n %>
</h1><h2>
<%
int a = -1, b = 1, c;
c = a + b;
do
{ %>
<% =c%> <%
a=b;
b=c;
c=a+b;
} while (c <= n);
%> </h2>
</div>
</form>
</body>
</html>
Output
More Examples on Code Render Block
The following example shows how to generate a code using a string. Basically, we have a string consisting of alphabets, digits, and special characters. The program should display the string with alternate uppercase and lowercase letters. However, the output string should omit all digits and special characters. Further, the first character in the output string should be in upper case. For instance, if the input is anj67ty$#km, the output should be AnJtYkM.
Another example comprises of displaying a sequence using a specific number as the first one in the sequence. Also, there are two more inputs representing the gap between consecutive numbers in the sequence. For example, if the input is 2, 4, and 3, the series will be 2 6 9 13 16 20 23 27 30 and so on.
Further Reading
Examples of List Controls in ASP.NET
Parameter and ParameterCollection in ADO.NET
Database Manipulation Using DataGrid
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