C# help on atm simulator c sharp application

Question

4.00/5 (1 vote)

See more:

i bulid a simple atm simulator..

i have a login system to move to the atm simulator menu

in which for depositing amount...

i have text fields..

user name: textfield
deposit amount: textfield

deposit button to deposit money..

MAcmd.CommandText = "Update registeraccount Set Balance =Balance+'" + c + "'where username='" + txtusername.Text + "'"; same for the balance inquiry menu..

MAcmd.CommandText = "SELECT * FROM registeraccount WHERE username='" + textBox1.Text + "'";

I jusst want to erase that username check again nd again..

i want tha balance just appears as we click balace button.. no need to enter the username.. acount username is pointing the current user thats y i point this..

simlarly i want that if i deposit amount.. i just enter the deposit amount and no user name.. so that just the amount of login user update automatically without that check username

waiting for answer...

Posted 23-Mar-11 7:54am

codegeekalpha

Updated 23-Mar-11 8:10am

Wendelius

v3

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Wendelius · Answer 1 · 2011-03-23T08:12:00

This doesn't answer your actual question but use parameters instead of string literals in you SQL statements. See: http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlparameter.aspx[^].

Just an example, your database could be totally erased or the machine formatted with proper commands written to the txtusername.

Sergey Alexandrovich Kryukov · Answer 2 · 2011-03-23T12:31:00

Solution 2

Just a side note: never use multiple "+" to concatenate strings, use string.Format instead. In the loop, always use System.Text.StringBuilder. Remember, strings are immutable. Do I need to explain how much would be the performance leak due to this simple fact?

—SA

Posted 23-Mar-11 12:31pm

Sergey Alexandrovich Kryukov