concepts of some comands of C#

Question

what does it means: using System.ComponentModel; using System.Data; using System.Data.SqlClient; using System.Drawing using System.Text using System.Windows.Forms; Please respond as quikly as you can it´s an emergency and I can´t find it on google. Thanks.

Bianyerys Milagros Lora Baldera · Answer

Thak u so much!! Just saved my accademic life :D

Vulpes · Answer

The 'using' directive imports namespaces into a C# source code file and is a way of abbreviating the code you otherwise have to write. Suppose for example you wanted to use the StringBuilder class in your program which is in the System.Text namespace. If you don't have: using System.Text; in your file then you have to write this: System.Text.StringBuilder sb = new System.Text.StringBuilder(); However if you do have that particular using directive in your file then you can shorten it to this: StringBuilder sb = new StringBuilder(); The six using directives you've listed contain namespaces whose classes are often used in a Windows Forms application. If you want to know which classes are in each namespace then search for them in MSDN which contains documentation for all .NET entities. For more on the using directive check this link: http://msdn.microsoft.com/en-GB/library/sf0df423.aspx