Help Needed in Dynamic Sql or alternate to Dynamic Sql

Question

Hi Am working in sqlserver 2008 R2 and here is my Table structure and SPC
;create table SalaryReport(IdSalary int primary key identity(1,1),
IDMainCompany int,IDSubCompany int,Salary money,Incentive int,NoofEmployees int, SalaryDate datetime, Creditscore int );
insert into SalaryReport (IDMainCompany,IDSubCompany,Salary,Incentive,NoofEmployees,SalaryDate,Creditscore)
( Select 100 as IDMainCompany , 1000 as IDSubCompany ,200000 AS Salary, 20000 as Incentive, 500 as NoofEmployees,
'2014-01-01' as SalaryDate, 60 as Creditscore union all
Select 100 as IDMainCompany , 1001 as IDSubCompany ,300000 AS Salary, 40000 as Incentive, 600 as NoofEmployees,
'2014-01-01' as SalaryDate , 70 as Creditscore union all
Select 100 as IDMainCompany , 1002 as IDSubCompany ,400000 AS Salary, 40000 as Incentive, 1500 as NoofEmployees,
'2014-01-01' as SalaryDate , 45 as Creditscore union all
Select 101 as IDMainCompany , 1003 as IDSubCompany ,30000 AS Salary, 2000 as Incentive, 100 as NoofEmployees,
'2014-01-01' as SalaryDate, 60 as Creditscore union all
Select 102 as IDMainCompany , 1004 as IDSubCompany ,450000 AS Salary, 25000 as Incentive, 700 as NoofEmployees,
'2014-01-01' as SalaryDate, 30 as Creditscore)
Sample Test Script:
DECLARE @IDMainCompany int = 100;
DECLARE @Process_Date datetime = '2014-01-01';
declare @Query nvarchar(max);
SELECT
CAST(SR.IDMainCompany AS VARCHAR(12)) AS IDMainCompany
,CAST(SR.IDSubCompany AS VARCHAR(12)) AS IDSubCompany
,CAST(SR.Salary AS VARCHAR(12)) AS Salary
,CAST(SR.Incentive AS VARCHAR(12)) AS Incentive
,CAST(SR.NoofEmployees AS VARCHAR(12)) AS NoofEmployees
,CAST(SR.SalaryDate AS VARCHAR(15)) AS SalaryDate
,CAST((SR.Creditscore) AS VARCHAR(15)) AS average
FROM SalaryReport SR
WHERE SR.IDMainCompany = @IDMainCompany
AND DATEPART(MM, SR.SalaryDate) = DATEPART(MM, @Process_Date)
UNION ALL
SELECT
'' AS IDMainCompany
,'' AS IDSubCompany
,'Total: ' + CAST(SUM(SR.Salary) AS VARCHAR(12)) AS Salary
,'Total: ' + CAST(SUM(SR.Incentive) AS VARCHAR(12)) AS Incentive
,'Total: ' + CAST(SUM(SR.NoofEmployees) AS VARCHAR(12)) AS NoofEmployees
,'' AS SalaryDate
,'Total: ' +CAST(avg(SR.Creditscore) AS VARCHAR(12)) AS Totalaverage
FROM SalaryReport SR
WHERE SR.IDMainCompany = @IDMainCompany
AND DATEPART(MM, SR.SalaryDate) = DATEPART(MM, @Process_Date)
group by IDMainCompany, DATEPART(MM, SalaryDate)
the sample data i posted is having less columns. actually i have 20 columns in the select list. Also the parameters to the where condition i gave two i.e IDMainCompany, SalaryDate. I will also need to use IDSubCompany for some case. My skeleton will be 
Create Procedure Test(@IDMainCompany int, @IDSubCompany int = null, @SalaryDate datetime)
as
BEGIN
IF(@IDMainCompany is not null && @IDMainCompany > 0 && @SalaryDate is not null && @SalaryDate <> ' ' &&
@IDSubCompany is null)
BEGIN
--The logic what discussed on previous posts will falls here with @IDMainCompany, @SalaryDate as parameter to the where condition
END
IF(@IDMainCompany is not null && @IDMainCompany > 0 && @SalaryDate is not null && @SalaryDate <> ' ' &&
@IDSubCompany is null && @IDSubCompany > 0 )
BEGIN
--The logic what discussed on previous posts will falls here with @IDMainCompany, @SalaryDate,@IDSubCompany as parameter to the where condition
END
END
As said i need to include 20 columns in the select list and as union all used on the previous sample there are 20 columns on the first query and 20 columns on the second query after the union all. The SPC will become big. If i repeat this for second if condition,
it will be too big. How can i reduce this writing more lines.
I am aware of the concept dynamic sql. Is there any other way to do this? or if dynamic sql is the only option, can anyone help me rewriting this select statements as dynamic sql
Could anyone please assist me 
loving dotnet

Answer 1

>>
thanks for your reply and yes, i am invoking this from my asp.net application using C# language.  Would you like to share something?
<<
Yes,
You can use client side dynamic sql. I'm not talking about concatenating strings. I'm talking about using Runtime Text Tamplates (preprocesed templates in Visual Studio 2010).
Add a new "Runtime Text Template" item to your VS project. Be "MyReportTemplate.tt" the file name of the runtime text template.  The content of this file should be something like the following:
<#@ template language="C#" #>
<#@ assembly name="System.Core" #>
SELECT
-- part of your query goes here
-- the interesting part come next
FROM
SalaryReport SR
WHERE
SR.IDMainCompany = @IDMainCompany
<# if (IDSubCompany.HasValue && IDSubCompany.Value > 0) { #>
AND SR.IDSubCompany = @IDSubCompany
<# } #>
AND
DATEPART(MM, SR.SalaryDate) = DATEPART(MM, @Process_Date)
GROUP BY
IDMainCompany, DATEPART(MM, SalaryDate)
Add a new c# code file named MyReportTemplate.partial.cs closed to MyReportTemplate.tt with the following code:
public partial class MyReportTemplate
public int? IDSubCompany { get; set; }
Then, to execute the query you can write a code similar to the following:
public DataTable ExecuteReport(int mainCompanyId, int? subCompanyId, DateTime processDate )
using (var cn = CreateConnection())
using (var cmd = new SqlCommand())
using (var adapter = new SqlDataAdapter(cmd))
cmd.Connection = cn;
var template = new MyReportTemplate
IDSubCompany = subCompanyId
cmd.CommandText = template.TransformText();
cmd.Parameters.AddWithValue("@IDSubCompany", subCompanyId == null ? (object) DBNull.Value : subCompanyId.Value);
cmd.Parameters.AddWithValue("@IDMainCompany", mainCompanyId);
cmd.Parameters.AddWithValue("@Process_Date", processDate);
var table = new DataTable();
adapter.Fill(table);
return table;
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