Wednesday, December 2, 2015

LINQ - Group multiple columns or keys

Using .NET linq you can easily group data in a list. This is an example of grouping data based on multiple keys.

This is the class that I created for testing
public class Employee
public string Name { get; set; }
public string Department { get; set; }
public string SubDepartment { get; set; }
public float Salary { get; set; }

This is the multi- key grouping using LINQ
/*create employee list*/
List<Employee> emps = new List<Employee>();

/*Add test data */
emps.Add(new Employee() { Name = "Employee 1", Department = "HR", SubDepartment="Recruitment",  Salary = 4000 });
emps.Add(new Employee() { Name = "Employee 2", Department = "HR",SubDepartment="Recruitment", Salary = 4500 });
emps.Add(new Employee() { Name = "Employee 3", Department = "Tech",SubDepartment="Engineering", Salary = 5000 });
emps.Add(new Employee() { Name = "Employee 4", Department = "Tech",SubDepartment="Engineering", Salary = 5200 });

/*group data based on departments*/
List<Employee> newlist = (from x in emps
group x by new { x.Department, x.SubDepartment } into grp
select new Employee()
Department = grp.Key.Department,
SubDepartment = grp.Key.SubDepartment,
Salary = grp.Sum(x => x.Salary)

Tuesday, April 7, 2015

HTML help/info control

Given below is code to show help information next to controls(like textbox, dropdownlist etc). This will show help info next to the control “onfocus” event. This feature can be attached to other events also like “onmouseover”,”onclick” etc.

The control will look like this - 

Set the script and style in html head

    var prevmsgControlName;
    var timeoutVar;
    function showControlMessage(control, msg) {
        var msgControlName = 'message_' +;

        if (prevmsgControlName) {
            document.getElementById(prevmsgControlName).style.display = "none";
        if (document.getElementById(msgControlName) == null) {
            var tempDiv = document.createElement("div");
   = msgControlName;
            var rect = control.getBoundingClientRect();
            tempDiv.innerHTML = msg;
            tempDiv.className = "client_message";

   = Number(rect.left + control.offsetWidth + 5) + "px";
   = + "px";
            timeoutVar = setTimeout(hideControlMessage, 8000);
            prevmsgControlName = msgControlName;
        else {
            document.getElementById(msgControlName).style.display = "block";
            timeoutVar = setTimeout(hideControlMessage, 8000);
            prevmsgControlName = msgControlName;
    function hideControlMessage() {
        document.getElementById(prevmsgControlName).style.display = "none";

.client_message {
    border:1px solid black;
    background-color:rgb(250, 250, 188);
    width: 300px;

Once the script and style are set in head, you can add help info to control as given below.

<input id="control1" type="text" onfocus="showControlMessage(this,'Replace with help info you want to show for the control')" />

Friday, January 30, 2015

How to use SOLR.NET to add/search documents from SOLR

In this article we will look into how to use SOLR to add and query data using  SOLR.NET

Install Apache Tomcat and  SOLR

1. Install Java version 6 or above

2.Download Apache Tomcat -Core: 32-bit/64-bit Windows Service Installer (pgp, md5)
After you install apache tomcat you can check if service is running by checking the location -http://localhost:8080/

Details on how to install and run SOLR is clearly stated in the below awesome articles

Use SOLR.NET to connect to SOLR

So now that we have Apache and SOLR running let’s look at how to use this in ASP.NET(C#)

1.Download SOLR.NET -

2.Compile the project and get the dlls from SOLRNET project (there will be SolrNet.dll, Microsoft.Practices.ServiceLocation.dll, HttpWebAdapters.dll and the pdb and xml files)

3.Create an empty ASP.NET project

4.Create a new folder in this project and copy the dlls from SOLRNET project (step 2) to that folder.

5.Add references to the 3 dlls

6.Add Global.asax and initialize SOLR.NET connection in application start
  protected void Application_Start(object sender, EventArgs e)

7.Create a class which has the same fields as the schema in SOLR. For testing purpose I added only 2 fields from schema
public class SolrSearchResult
            public string id { get; set; }

            public string title { get; set; }

8.Now we are ready to add documents to SOLR! Given below is the function to add documents to SOLR
public void AddData()
            ISolrOperations<SolrSearchResult> solr = ServiceLocator.Current.GetInstance<ISolrOperations<SolrSearchResult>>();
            SolrSearchResult test = new SolrSearchResult() { id = "changeme2", title = "changeme2" };

9.To search data use the below function

public void SearchData()
            ISolrOperations<SolrSearchResult> solr = ServiceLocator.Current.GetInstance<ISolrOperations<SolrSearchResult>>();
            SolrQueryResults<SolrSearchResult> results = solr.Query(new SolrQuery("id:\"changeme2\""));
            foreach (SolrSearchResult result in results)

Thursday, January 29, 2015

Group and pivot data in SQL

Given below is an example of how to group and pivot data in SQL .This example shows you how to group data in CSV format and pivot it.

--Create temp table
CREATE TABLE  #car_data (company varchar(10), model varchar(20))

--Insert data
INSERT INTO #car_data (company,model) values ('Ford','Escape')
INSERT INTO #car_data (company,model) values ('Ford','Explorer')
INSERT INTO #car_data (company,model) values ('Ford','Expedition')

INSERT INTO #car_data (company,model) values ('Chevy','Cruze')
INSERT INTO #car_data (company,model) values ('Chevy','Impala')
INSERT INTO #car_data (company,model) values ('Chevy','Silverado')

-- Group data in CSV format
    ,STUFF((SELECT ', ' + model
        FROM #car_data with(nolock)
        WHERE company =
        FOR XML PATH(''), TYPE)
    .value('.','VARCHAR(400)'),1,2,' ') List_Output
FROM #car_data t with(nolock)