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Author name: vivek Jaiswal

OTP Generator

OTP (One Time Password) Send it from any Sms Service, and how it is used.

What is OTP?

A one-time password (OTP) is an automatically generated numeric or alphanumeric string of characters that authenticates a user for a single transaction or login session.

 Why to use OTP?

An OTP is more secure than a static password, especially a user-created password, which can be weak or reused across multiple accounts.

OTPs may replace authentication login information or may be used in addition to it to add another layer of security.

Why I wrote this article?

To describe how the one-time password works in a simple way and How you can use it in your application.

For sending the OTP, We can create a post method, which will have the Phone Number as input and the otp will be sending to that 10-digit mobile number in form of a text SMS.


        public JsonResult SendOTP(string number)


            var status = “fail”;

            if (number != “”)


                status = “Invalid”;

                if (number.Length == 10)


                    string otpValue = new Random().Next(100000, 999999).ToString();



                     ///   Sms Sending Code.

                        var messageAPI = new MessageAPI();

                        string smsBody = “Your OTP Number is ” + otpValue + ” ( Sent By : XT)”;

//SMS Service Logic//

                        string smsResult = messageAPI.SendSmsViaNewAPI(smsBody, number);

                        status = smsResult;

                        Otp createOtp = new Otp()


                            PhoneNo = number,

                            OtpValue = otpValue,

                            CreatedDate = DateTime.Now,

                            ExpiryDate = DateTime.Now.AddMinutes(10),

                            IsVerify = 0



                        return Json(status, JsonRequestBehavior.AllowGet);


                    catch (Exception e)


                        throw (e);




            return Json(status, JsonRequestBehavior.AllowGet);


This Above Code will send the OTP to  Mobile Number.

Now How to Verify the OTP? Which the user will enter what has been received in the Sms.

For that We need a Verify or Validating Otp Method ,Which will check the Enter OTP is correct or not.


        public JsonResult VerifyOTP(string otp)


            bool result = false;

//Code to Verify the OTP

            var resultData = otpManager.VerifyOtp(otp);

            if (resultData != null && resultData.Tables[0] != null && resultData.Tables[0].Rows.Count > 0)


                result = true;

// Code to Update that the OTP which is entered is used.



            return Json(result, JsonRequestBehavior.AllowGet);


The above code will verify the OTP.

OTP Generator Read More »

Document Preview.

(For Previewing the Png, Jpg,Pdf, and Docx) File Directly on the page, without Downloading it.

 In this project, document can be previewed in the current tab, new tab as well as new window on a click of a link.

You can use the same link for all preview method or you can change the link.

Just you need to make the perfect URL with the website name then folder name then file name that’s all, and it is done your preview for the document will work fine.

For example :

             string websitePath = “https://xtremethoughts.com/”;

            string LocationPath = “Documents/”;

            string fileName = “VivekDocumentPreview.pdf”;

It will make the perfect URL, which can be used to view the File.

  • For example for Image File.
  • While clicking on JPGPreview.
  • For example for PDF File.
  • While clicking on PDFPreview.
  • For example for WordFile.
  • While clicking on WordPreview.
  • For example for PNGFile.
  • While clicking on PNGPreview.
  • For example for WordFile.
  • While clicking on Word Preview In NewWindow.
  • For example for PDFFile.
  • While clicking on PDFPreview In NewWindow.

Source code

Source code for this sample is available on GitHub at github.com/vjvivekjaiswal1998/DocumentPreview

Document Preview. Read More »

Pivot Table From Sql Server

How To Return A Pivot Table From Sql Server. 

What is a pivot table and why to use Pivot Table?

PivotTable is an interactive way and very quickly way to summarize all the large amounts of data which are on daily bases. You can use a PivotTable to analyze numerical data in detail, and answer unanticipated questions about your data. PivotTable is especially made for desiging the  Querying in a very large amounts of data and in a simple and user-friendly ways.

So, we can summarized are data very quickly in a  simple way.

What is pivot table example?

A Pivot table is a table of stats which summarizes the data as sums, averages, and many other statistical measures. Let’s assume that we got data of any real estate project with different fields like type of flats, block names, area of the individual flats, and their different cost as per different services, etc.

Why I wrote this article?

I have been searching a long for making a pivot table with dynamic columns, but I was not able to find.

We have to specify the name of column, so that column will appear in that pivot table.

So for this reason, I am writing this blog so other may get some help from it.

How do you create a pivot table with static columns?

Let us take a look at an example of Vehicle table.

In this example we will get the distance for vehicles for specific dates.

In this table it consists off Vehicle Id, Vehicle Name, Daily Vehicle Distance, Start Date and End Date of Distance Covered. 

CREATE TABLE [dbo].[Vehicles](

            [Id] [int] NULL,

            [VehicleId] [int] NULL,

            [VehicleName] [varchar](50) NULL,

            [StartDate] [datetime] NULL,

            [EndDate] [datetime] NULL,

            [Distance] [float] NULL


Below is the query which returns distance for vehicles for specific dates:

Declare @StartDate DATETIME,@EndDate DATETIME,@cols AS NVARCHAR(MAX) 

SELECT @StartDate = ‘2020-12-31’, @EndDate = ‘2021-01-05’; 



SELECT VehicleId ,VehicleName, StartDate,Distance FROM [vivek].[dbo].[Vehicles] 

WHERE StartDate  BETWEEN  @StartDate   AND @EndDate 

) as SourceTable 



max(Distance) FOR  StartDate in   





Result for above query looks like below,

How do you create a pivot table with dynamic columns?

Let us take a look at an example. In this example we will get the distance for vehicles for dynamic dates.

As we need dates as dynamic columns,

we have to get list of distinct dates from table based upon filter criteria. We then concatenate comma separate dates as string.

Next step is to create an dynamic query which use the dynamic columns which we prepared as a string.

Final step is to execute the dynamic query using sp_executesql statement.

Declare @StartDate DATETIME,@EndDate DATETIME

SELECT @StartDate = ‘2020-12-31’, @EndDate = ‘2021-01-05’; 


WITH ListDates(AllDates) AS

(    SELECT @StartDate AS DATE



    FROM ListDates 

    WHERE AllDates < @EndDate)

SELECT AllDates   into   #table FROM ListDates 



select @cols = STUFF((SELECT ‘,’ + QUOTENAME(convert(char(10), AllDates, 120)) 

                    from #table

                    group by AllDates

                    order by AllDates 

            FOR XML PATH(”), TYPE

            ).value(‘.’, ‘NVARCHAR(MAX)’) 


                        SET @sql = ‘select * from (SELECT VehicleId ,VehicleName, StartDate,Distance FROM [vivek].[dbo].[Vehicles]   


            pivot ( max(Distance) for  StartDate in    (‘ + @cols + ‘)) piv ORDER BY VehicleId’

EXEC Sp_executesql @sql 



The Result Will looks like below:

Pivot Table From Sql Server Read More »