C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace ccslabsLogIn.forms
{
    public partial class frmRegister : Form
    {

        #region "Properties"

        private bool _Registered = false;

        public bool Registered
        {
            get { return _Registered; }
            set { _Registered = value; }
        }
        private string _Username = "";

        public string Username
        {
            get { return _Username; }
            set { _Username = value; }
        }

        #endregion

        public frmRegister()
        {
            InitializeComponent();
        }

        private void btnCancel_Click(object sender, EventArgs e)
        {
            Registered = false; // tell calling form the user DID NOT register
            this.Close(); // close the form
        }

        // register the dude.
        private void btnRegister_Click(object sender, EventArgs e)
        {
            RegisterUser();
        }

        // Register the User
        private void RegisterUser()
        {
            if (tbUsername.Text.Length > 0) // You may want longer than 1 char minimum for usernames
            {
                if (tbPassword.Text != tbRepeatPassword.Text) { MessageBox.Show("Passwords do not match"); RegisterUser(); } // passwords do not match retry
                // ok passwords do match are they empty?
                if (tbPassword.Text.Length == 0) { MessageBox.Show("Passwords can not be empty"); RegisterUser(); } // empty passwords try again!
                // Ok username and passwords are valid.
                // register the user !
                usersTableAdapter.Insert(tbUsername.Text, tbPassword.Text);
                Registered = true;
                this.Close();
            }
            MessageBox.Show("Username can not be empty");
            RegisterUser();
        }

        private void usersBindingNavigatorSaveItem_Click(object sender, EventArgs e)
        {
            this.Validate();
            this.usersBindingSource.EndEdit();
            this.tableAdapterManager.UpdateAll(this.applicationDataSet);

        }

        private void frmRegister_Load(object sender, EventArgs e)
        {
            // TODO: This line of code loads data into the 'applicationDataSet.Users' table. You can move, or remove it, as needed.
            this.usersTableAdapter.Fill(this.applicationDataSet.Users);

        }
    }
}

public static class Extensions
{
    public static string GetFirstThreeCharacters(this String str)
    {
        if(str.Length < 3)
        {
            return str;
        }
        else
        {
            return str.Substring(0,3);
        }
    }
}

String str = "my new String";
str = str.GetFirstThreeCharacters();

<bindings>
           <basicHttpBinding>
               <binding name="BasicHttpBinding_IViewerService" closeTimeout="00:10:00"
                   openTimeout="00:10:00" receiveTimeout="00:10:00" sendTimeout="00:10:00"
                   allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
                   maxBufferSize="2147483647" maxBufferPoolSize="2147483647"
                   maxReceivedMessageSize="2147483647" messageEncoding="Mtom"
                   textEncoding="utf-8" transferMode="Buffered" useDefaultWebProxy="true">
                   <readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647"
                       maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />
                   <security mode="None">
                       <transport clientCredentialType="None" proxyCredentialType="None" realm="">
                           <extendedProtectionPolicy policyEnforcement="Never" />
                       </transport>
                       <message clientCredentialType="UserName" algorithmSuite="Default" />
                   </security>
               </binding>
           </basicHttpBinding>

           <wsHttpBinding>
               <binding name="WSHttpBinding_IViewerService" closeTimeout="00:10:00"
                   openTimeout="00:10:00" receiveTimeout="00:10:00" sendTimeout="00:10:00"
                   bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard"
                   maxBufferPoolSize="2147483647" maxReceivedMessageSize="2147483647"
                   messageEncoding="Mtom" textEncoding="utf-8" useDefaultWebProxy="true"
                   allowCookies="false">
                   <readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647"
                       maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />
                   <reliableSession ordered="true" inactivityTimeout="00:10:00"
                       enabled="false" />
                   <security mode="Message">
                       <transport clientCredentialType="Windows" proxyCredentialType="None"
                           realm="">
                           <extendedProtectionPolicy policyEnforcement="Never" />
                       </transport>
                       <message clientCredentialType="Windows" negotiateServiceCredential="true"
                           algorithmSuite="Default" establishSecurityContext="false" />
                   </security>
               </binding>
           </wsHttpBinding>
       </bindings>
<client>
           <endpoint address="http://97.87.12.242:1003/Rlc/Viewer" binding="basicHttpBinding"
               bindingConfiguration="BasicHttpBinding_IViewerService" contract="ViewerProxy.IViewerService"
               name="BasicHttpBinding_IViewerService" />
       </client>