Formulating Code and SQL Query - sql-server

Question

I have a Table in DB named 'Retail'
CustomerID Itemset
1 1
1 3
1 7
2 6
2 7
3 4
... ...
I want to write this table in Datatable 'Matrix' where the Rows are Itemset={1,2,3,4,5,6....,k} and Columns are CustomerID={1,2,3,4,...,x}
and the rows are 1 if the 'Itemset' belongs to the CustomerID.
The output I want is like..
1 2 3 4 5 6 7 ............. x
1 1 0 1 0 0 0 1 0 0 0 0 0 0 0 0
2 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0
3 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0
4
5
6 /And so on!
7
8
9
`
I tried to code it but the problem is in VS Parameters for SQL Query don't work with Loops.
This is my code-
objConnection.Open()
Dim matrix As DataTable = New DataTable("Retail")
intcount = 0
For intcount = 1 To noofCustomerID_col
matrix.Columns.Add(intcount, GetType(Integer))
Next
Dim i As Integer
Dim workRow As DataRow
Dim Boolin As Boolean
For i = 1 To 9
ObjCommand.CommandText = "Select count(*) from Retail Where CustomerID=#in and Itemset=#in"
ObjCommand.Parameters.AddWithValue("#in", i) {{I Get Error here as I can't Loop Parameters}}
Boolin = ObjCommand.ExecuteScalar()
workRow = matrix.NewRow()
workRow(0) = i
workRow(1) = Boolin
matrix.Rows.Add(workRow)
Next
Kindly Help. I know this code can completely be wrong and it's okay if you can suggest totally different way of doing it. I've been stuck for quite some time now! Thanks.
If any clarification is needed I shall explain as many times needed in the comments.

Answer 1

Like Tab Alleman suggested, SQL PIVOT can come handy here.
Dynamic SQL is also needed.
DECLARE #DynamicColumn NVARCHAR(MAX),
#DynamicQuery NVARCHAR(MAX)
SELECT #DynamicColumn = SELECT '[' + CONVERT(NVARCHAR, CustomerID) + '],'
FROM Retail AS Customer
ORDER BY CustomerID
FOR XML PATH('')
SELECT #DynamicColumn = SUBSTRING(#DynamicColumn, 0, DATALENGTH(#DynamicColumn) / 2)--REMOVE EXTRA ","
SELECT #DynamicQuery = 'SELECT *
FROM ( SELECT CustomerID,
ItemSet
FROM Retail) AS D
PIVOT
(
COUNT([CustomerID])
FOR Itemset IN (' + #DynamicQuery + ')
) AS P'
EXECUTE(#DynamicQuery)