excel - VBA, importing large data from multiple workbooks into mastersheet -


my code opens file picker , selects files , particular column im interested in combining master worksheet.

i pick several .csv files , bring in column of choosing .

issue have are,

1) these files large, 400kb.

2) run time error 1004, copy area , paste area not same size , shape. running out of space on excel sheet? when debug error on line copyrng.copy destrng

my end goal see , count , see unique values col c(perhaps other columns) workbooks.

option explicit dim wsmaster workbook, csvfiles workbook dim filename string dim file integer dim r long  public sub consolidate()      application         .screenupdating = false         .enableevents = false     end      application.filedialog(msofiledialogopen)         .allowmultiselect = true         .title = "select files process"         .show          if .selecteditems.count = 0 exit sub          set wsmaster = activeworkbook  dim copyrng range, destrng range dim firstrow long file = 1 .selecteditems.count      filename = .selecteditems.item(file)      if right(filename, 4) = ".csv"         set csvfiles = workbooks.open(filename, 0, true)         r = wsmaster.sheets("sheet1").range("c" & rows.count).end(xlup).row         '' main new part         set copyrng = csvfiles.sheets(1).range("c1:c" & r)         wsmaster.sheets("sheet1")             firstrow = .cells(.rows.count, 2).end(xlup).row             set destrng = .range("a" & firstrow + 1).offset(0, 1)         end          copyrng.copy destrng         ''''''''''         csvfiles.close savechanges:=false    'close without saving     end if next file      end      set wsmaster = nothing     set csvfiles = nothing      application         .screenupdating = true         .enableevents = true      end  end sub

updated code below recommendation

option explicit dim wsmaster workbook, csvfiles workbook dim filename string dim file integer dim r long  public sub consolidate()      application         .screenupdating = false         .enableevents = false     end      application.filedialog(msofiledialogopen)         .allowmultiselect = true         .title = "select files process"         .show          if .selecteditems.count = 0 exit sub          set wsmaster = activeworkbook  dim copyrng range, destrng range dim firstrow long file = 1 .selecteditems.count      filename = .selecteditems.item(file)         if right(filename, 4) = ".csv"     set csvfiles = workbooks.open(filename, 0, true)     r = csvfiles.sheets(1).range("c" & rows.count).end(xlup).row     '' main new part     set copyrng = csvfiles.sheets(1).range("c1:c" & r)     wsmaster.sheets("sheet1")         firstrow = .cells(.rows.count, 2).end(xlup).row + 1         set destrng = .range("b" & firstrow & "b" & (firstrow + r))     end      destrng.value = copyrng.value     ''''''''''     csvfiles.close savechanges:=false    'close without saving end if   next file      end      set wsmaster = nothing     set csvfiles = nothing      application         .screenupdating = true         .enableevents = true      end  end sub

since number of rows defined r can set dimensions of destination range. change below should fix copy-paste error , speed code eliminating use of clipboard (assuming want values copied).

if right(filename, 4) = ".csv"     set csvfiles = workbooks.open(filename, 0, true)     r = csvfiles.sheets(1).range("c" & rows.count).end(xlup).row     '' main new part     set copyrng = csvfiles.sheets(1).range("c1:c" & r)     wsmaster.sheets("sheet1")         firstrow = .cells(.rows.count, 2).end(xlup).row + 1         set destrng = .range("b" & firstrow & ":b" & (firstrow + r))     end      destrng.value = copyrng.value     ''''''''''     csvfiles.close savechanges:=false    'close without saving end if

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