UserID and Password

Question

1.I m a begining student of C#.I want to do form with userid and password boxes by using access table.How can I do this.Would you like to tell me step by step. 2.if I do like this -----string sorgusu=string.Format("SELECT COUNT(UsersID) FROM Users WHERE UserName = '50' AND UserPassword = 'A1'");---------form is working but if it is like this string sorgusu=string.Format("SELECT COUNT(UsersID) FROM Users WHERE UserName = textBox1.text AND UserPassword = textBox2.text"); WHAT MUST I DO? 3.IS THERE ANY NOTES ABOUT SELECTION STATEMENTS WHICH IS USED IN C# FOR ACCESS TABLES THANKS YOU VERY MUCH