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Now, on many sites we can see image verification or human verification codes. By entering the verification code shown on the web page when a user sign up, the web site or application can prevent automated registrations. This reduces system loads and ensures better performance and security of web site or application. This tutorial will show you how to create the randomly generated verification code in ASP.NET 2.0 and C#. Now, questions arises how to make these code. Now, time to say thanks to .net who had given a wonderfull library with the name of System.Drawing. Before stating any thing import System.Drawing. Copy this code: Using System.Drawing; In order to create a random verification code, we create a method called CreateRandomCode at first public string CreateRandomCode(int codeCount) { string allChar = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z"; string[] allCharArray = allChar.Split(','); string randomC...

Encryption and decryption The System.Security.Cryptographic namespace in the Microsoft .NET Framework provides a variety of tools to help you with encryption and with decryption. The CryptoStream class is one of the many classes that is provided. The CryptoStream class is designed to encrypt or to decrypt content as it is streamed out to a file. You can download working example also. This is a basic example so, if you have any more questions please let me know.

In contemporary world we have so many powerfull tools for version control like VSS, Tortoise SVN etc. With help of there tools we can check different version of file with dates and other information. But, what if I have to simply compare two files like notepad, word etc. Let's take an simle example. I had made a file .cs file a year ago. I had made so many changes in that a year. Now I am facing some problem in my code. I have only option to check older versions of my file, which is a time consuming job. Means after each version I have to build and test my code. Let me suggest you a simple solution which I had found on net using scootter softwares (Download Beyond Compare) Beyond Compare allows you to quickly and easily compare your files and folders. By using simple, powerful commands you can focus on the differences you're interested in and ignore those you're not. You can then merge the changes, synchronize your files, and generate reports for your records. You can co...

Recommended reading part I Use Type-Safe SQL Parameters The Parameters collection in SQL Server provides type checking and length validation. If you use the Parameters collection, input is treated as a literal value instead of as executable code. An additional benefit of using the Parameters collection is that you can enforce type and length checks. Values outside the range will trigger an exception. The following code fragment shows using the Parameters collection: SqlDataAdapter myCommand = new SqlDataAdapter("AuthorLogin", conn); myCommand.SelectCommand.CommandType = CommandType.StoredProcedure; SqlParameter parm = myCommand.SelectCommand.Parameters.Add("@au_id",SqlDbType.VarChar, 11); parm.Value = Login.Text; In this example, the @au_id parameter is treated as a literal value instead of as executable code. This value is checked for type and length. If the value of @au_id does not comply with the specified type and length constraints, an exception will be thrown....

When first time I had heard about SQL Injection attack, I got afraid what the thing about, who can even insert, select and drop my tables from my database. After searching on internet and visiting many of website I came to some of the conclusions. What is SQL injection attack? SQL injection is an attack in which malicious code is inserted into strings that are later passed to an instance of SQL Server for parsing and execution. Any procedure that constructs SQL statements should be reviewed for injection vulnerabilities because SQL Server will execute all syntactically valid queries that it receives. Even parameterized data can be manipulated by a skilled and determined attacker. The primary form of SQL injection consists of direct insertion of code into user-input variables that are concatenated with SQL commands and executed. A less direct attack injects malicious code into strings that are destined for storage in a table or as metadata. When the stored strings are subsequently conca...

With SQL Server 2000, Microsoft has introduced the concept of User-Defined Functions that allow you to define your own T-SQL functions that can accept zero or more parameters and return a single scalar data value or a table data type. As every one knows the importance of User defined functions. So, while using Sql Server 7. We have repeat a same code for many number of times. Following is the description about Use Defined Functions which we can create. There are three types of User-Defined functions in SQL Server 2000 and they are Scalar, Inline Table-Valued and Multi-statement Table-valued. How do I create and use a Scalar User-Defined Function? A Scalar user-defined function returns one of the scalar data types. Text, ntext, image and timestamp data types are not supported. These are the type of user-defined functions that most developers are used to in other programming languages. You pass in 0 to many parameters and you get a return value. Below is an example that is based in the d...

File uploading was always been a tedious task for the web developer community. Either we have to use a third party component or write several lines of code. Now, ASP.Net had make this easy to implemnet and deploy With ASP.NET file uploading has become a lot easier, importantly without the need for third party components. All we have to do is to use the ASP.NET HTML File control and write a few lines of C# code. In classic ASP we would use the HTML file control for uploading files. In ASP.net we replace this with the ASP.NET HTML File control. The declaration of ASP.NET HTML file control is much like normal HTML file control except for the runat attribute set to server. (e.g) <input type="file" id="myfile" name="myfile" runat="server" /> Similarly we use the ASP.NET button control which the the user will click to upload the file he has selected using the file control. As ASP.NET follows event based programming model we can attach a server s...

The ASP.NET Web.config file is used to define the configuration settings for an ASP.NET application. ASP.NET and the .NET Framework use .config files to define all configuration options. The .config files, including the ASP.NET Web.config file, are XML files. Server-wide configuration settings for the .NET Framework are defined in a file called Machine.config. The settings in the Machine.config file can be changed and those settings affect all .NET applications on the server. Different ASP.NET applications might need different application settings, that’s why defining those settings in the Machine.config file, is usually not practical. The solution for this problem is the ASP.NET Web.config file. The ASP.NET application configuration settings can be changed by creating a file called Web.config and saving it in the root folder of the application. But what if the Machine.config file defines different settings than the ones defined in your Web.config file? The good news is that the settin...