Cannot evaluate expression because the code of the current method is optimized

To fix problems with debugging due to optimized code:

1.) Pull up the project Properties under the "Project" menu

2.) Select the "Build" tab

3.) Uncheck "Optimize code" under the General area

Attach a client certificate to web service request

Attach an X509 client certificate to a web service request based on the certificates FriendlyName

1.)
//using
using System.Security.Cryptography.X509Certificates;

2.)
//Create web service
WS_Service service = new WS_Service();
//Add certificate
service.ClientCertificates.Add(GetCertificate(certificateName));
service.ExecuteServiceRequest();

3.)
//Adding Certificate
private X509Certificate GetCertificate(string certName)
{
    // Look in the local machine store.
    X509Store store = new X509Store(StoreName.My, StoreLocation.CurrentUser);
    store.Open(OpenFlags.ReadOnly);
    X509CertificateCollection col = (X509CertificateCollection)store.Certificates;
    X509Certificate cert = null;

    for (int i = 0; i < col.Count; i++)
    {
        string friendlyName = ((X509Certificate2)col[i]).FriendlyName;
        if (friendlyName.ToLower().Trim() == certName.ToLower().Trim())
        {
            cert = col[i];
            break;
        }
    }
    return cert;
}

SQL parse string

To parse a value from a column, PARSENAME and REPLACE can be used. 
For instance, if the variable portion of a URL needs to be parsed, it can be done like this:

SELECT PARSENAME(REPLACE('http://www.theurl.com?var=1234', 'var=', '.'), 1) //Returns 1234

C# deserialize JSON post

[Serializable]
public class Person
{
  public int personId;
  public int appId;
  public string name;
}
 
string input = new StreamReader(Request.InputStream).ReadToEnd();
JavaScriptSerializer deserializer = new JavaScriptSerializer();

Person _person = deserializer.Deserialize(input);
Console.Writeline(string.Format("Person delivered is: {0}", _person.name));

You can test this with the code below --------------------------------------------------:

string url = "the_test_url";
HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(url);
StringBuilder jsonData = new StringBuilder();

jsonData.AppendLine("{");
jsonData.AppendLine("\"personId\" : 1234,");
jsonData.AppendLine("\"appId\" : 2334,");
jsonData.AppendLine("\"name\" : \"John\"");
jsonData.Append("}");

byte[] dataArray = Encoding.UTF8.GetBytes(jsonData.ToString());
httpReq.Method = @"POST";
httpReq.ContentType = @"application/json";
httpReq.ContentLength = dataArray.Length;
httpReq.Timeout = 60000; // 1 minute (in milliseconds)
httpReq.KeepAlive = false;

using (Stream requestStream = httpReq.GetRequestStream())
{
  requestStream.Write(dataArray, 0, dataArray.Length);
  requestStream.Flush();
  requestStream.Close();
}
HttpWebResponse _resp = (HttpWebResponse)httpReq.GetResponse();
_resp.Close();

Using SQL recursion

This example will generate an employee/manager heirarchy.

DECLARE @employeeId INT
SET @employeeId = 123
WITH emp_hier AS
(
SELECT e.employeeId , e.managerEmployeeId, l.JobLevel as employeeLevel
FROM EmployeeData e
INNER JOIN EmployeeJobLevel l ON l.JobLevel=e.JobLevel
WHERE e.employeeId = @employeeid
UNION ALL
SELECT e2.employeeId , e2.managerEmployeeId, c2.JobLevel as employeeLevel
FROM EmployeeData e2
INNER JOIN EmployeeJobLevel  l2 ON l2.JobLevel=l2.JobLevel
INNER JOIN emp_hier ecte ON ecte.managerEmployeeId= g2.employeeId
WHERE ecte.employeeId <> ISNULL(g2.managerEmployeeId, -1) --This clause prevents maximum recursion error when two employees share each other as their supervisors
)

SELECT *
FROM emp_hier

One way to Hide/Show information without postback

This is a simple method of hiding or showing information based on a users action. It utilizes CSS, Javascript, and ASP.NET controls

1.) Define CSS for .visible and .hidden 
.visible
{
    visibility: visible;
    position: relative;
}
.hidden
{
    visibility: hidden;
    position: absolute;
} 

2.) Create separation of content using divs and set onchange event

<div>
    Do you want to show more info?
    <asp:dropdownlist  id="Question" onchange="javascript:HideShow(this, 'Detail')" runat="server">            
        <asp:listitem> </asp:listitem>
        <asp:listitem value="True">Yes</asp:listitem>
        <asp:listitem value="False">No</asp:listitem>
    </asp:dropdownlist>     </div>
<div id="Detail">
    Some additional information

</div>

 3.) Set onclick method to hide/show inline or via Javascript function call 



    HideShow(var ctl, var detailsSection){
        if (document.getElementById)
        {
            var e = document.getElementById(detailsSection);
             if (e != null)
            {
                 e.className = (ctl.selectedIndex != 1 ? 'hidden' : 'visible');
            }
         }
    }

Auto redirect a form when page loads

To redirect a form onload, set the onload event of the body

<html>
  <body onload="document.TheForm.submit();">
    <form name="TheForm" action="redirectURL" method="post">
      <input type="hidden" name="ID" value="valueToPass" />
    </form>
  </body>
</html>

*Note: setting a hidden input name/value pair will allow the receiving URL to pull and use that info being sent.