how to insert html tags in sql database

hi fri......,
             In my C# windows form i have one big text in which i want to store complete information of client. so that i want to use html tags to store data in text box. like.......
 
 name: my name is arvind
 
             // for next line
 address:  my address is mumbai   // mumbai should be displayed in Bold
 
i don't know for this what is the datatype for column in sql and what is the code in C# for text box.

so pls reply me.......