How to use GUID in asp.net C# for unique ID?

What is GUID ?

GUID stands for Globally Unique IDentifier. It is a string of numbers and/or letters.

A GUID represents a Unique identifier - means you cannot generate the same GUID more than once. A GUID has a very low (...practically impossible) probability of being duplicated 

Here is a sample code of GUID use in asp.net c#.

 Guid  newGuid =  Guid.NewGuid();

string query = "INSERT INTO tbl_info (UserID ,Username ,Emailaddress  ,Password  ,country)  VALUES                 (@UserID,@Username,@Emailaddress,@Password,@country)";

        cmd.CommandText = query;

        cmd.CommandType = CommandType.Text;

        cmd.Connection = con;

        cmd.Parameters.AddWithValue("@UserID", newGuid .ToString()); // GUID USE HERE

        cmd.Parameters.AddWithValue("@Username", UNTextBox.Text);

        cmd.Parameters.AddWithValue("@Emailaddress", EmailTextBox.Text);

        cmd.Parameters.AddWithValue("@Password", PasswordTextBox.Text);

        cmd.Parameters.AddWithValue("@country", CountryDropDownList.SelectedValue);

        con.Open();

        cmd.ExecuteNonQuery();

        con.Close();

        Response.Write("Registration successfull");

OUTPUT OF USER ID