SQL Query Transformation

I am importing user id's from CSV file into my Database. The source user id is of 4 character long and the destination user_id field is of 100 varchar. I just query the data so that i wan'a check that is said user id is already exist in the database or not . So i got this error. Read the script and error below
'************************************************* *********************
' Visual Basic Transformation Script
'************************************************* ***********************

' Copy each source column to the destination column
Function Main()

DIM v_user_id,rs, ConStr,sql
set rs = CreateObject("Adodb.Recordset")
set con = CreateObject("Adodb.Connection")

ConStr = "Provider=SQLOLEDB;Server=192.168.1.71;Database=tes tkaanza;uid=sa;pwd=sa"
v_user_id = DTSSource("Col001")
rs.open "Select user_id from tbl_gc_user_hdr where user_id = " + v_user_id,ConStr,0,1

if Not rs.eof then
MsgBox "Record Found"
else
MsgBox "Record Not Found"
end if
rs.Close
End Function

i got error from this line :
rs.open "Select user_id from tbl_gc_user_hdr where user_id = " + v_user_id,ConStr,0,1

Error message :

Error Source: Microsoft OLE DB Provider for SQL Server
Error Description:The conversion of the varchar value '1000015151910165' overflowed an int column. Maximum integer value exceeded.
Error Help File:
Error Help Context ID:0

Thank you in advance