Rule Definition
A typed DataSet is a class that derives from a DataSet. As such, it inherits all the methods, events, and properties of a DataSet. Additionally, a typed DataSet provides strongly typed methods, events, and properties. This means you can access tables and columns by name, instead of using collection-based methods. Aside from the improved readability of the code, a typed DataSet also allows the Visual Studio .NET code editor to automatically complete lines as you type. Additionally, the strongly typed DataSet provides access to values as the correct type at compile time. With a strongly typed DataSet, type mismatch errors are caught when the code is compiled rather than at run time.

Remediation
Use Typed DataSet instead of Untyped DataSet.

Violation Code Sample

// C# Sample: Using untyped DataSet:

//Create DataAdapter
SqlDataAdapter daEmp = new sqlDataAdapter( "SELECT empno,empname,empaddress FROM EMPLOYEE",conn);
//Create a DataSet Object
DataSet dsEmp = new DataSet(); // VIOLATION HERE
//Fill the DataSet
daEmp.Fill(dsEmp,"EMPLOYEE");
//Let us print first row and first column of the table
Console.Write(dsEmp.Tables["EMPLOYEE"].Rows[0][0].ToString());
//Assign a value to the first column
dsEmp.Tables["EMPLOYEE"].Rows[0][0] = "12345";//This will generate runtime error as empno column is integer

Fixed Code Sample

// C# Sample: Using Typed DataSet:

//Create DataAdapter
SqlDataAdapter daEmp = new SqlDataAdapter( "SELECT empno,empname,empaddress FROM EMPLOYEE",conn);
//Create a DataSet Object
EmployeeDS dsEmp = new EmployeeDS ();
//Fill the DataSet
daEmp.Fill(dsEmp,"EMPLOYEE");
//Let us print first row and first column of the table
Console.Write(dsEmp.EMPLOYEE[0].empno.ToString());
//Assign a value to the first column
dsEmp.EMPLOYEE[0].empno = "12345";//This will generate compile time error.

MSDN