Question

I have a text box that retrieve email from membership table in database. User may edit their email and update the new email. My question is, how to replace the old email with the new one? What is the query for sql?

SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["Connection"].ConnectionString);
    SqlCommand cmd = new SqlCommand("Insert into aspnet_membership("i dont know how whether to write all columns or only email);

    cmd.CommandType = CommandType.Text;
    cmd.Parameters.AddWithValue("@email", Textbox2.Text);

Answer 1

Try this:
You may need UserId, and new Email to replace existing email address for the given existing user.

SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["Connection"].ConnectionString);
SqlCommand cmd = new SqlCommand("UPDATE aspnet_membership SET email = @newEmail WHERE UserID = @userID");

cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
cmd.Parameters.AddWithValue("@email", Textbox2.Text);
cmd.Parameters.AddWithValues("@UserId", YourUserId);

conn.open();
cmd.ExecuteNonQuery();
conn.close();