how to create macro because values to be copy in DropDown are increasing always. and I have to give Source to Create List in Data Validation - vba

Question

I want to make drop Down List in sheet2 which contains values from sheet1 column. I have tried this code.
Sub testIt()
Dim r As Long, endRow As Long, pasteRowIndex As Long
endRow = 10 ' of course it's best to retrieve the last used row number via a function
pasteRowIndex = 1
For r = 1 To endRow 'Loop through sheet1 and search for your criteria
If Cells(r, Columns("B").Column).Value = "YourCriteria" Then 'Found
'Copy the current row
Rows(r).Select
Selection.Copy
'Switch to the sheet where you want to paste it & paste
Sheets("Sheet2").Select
Rows(pasteRowIndex).Select
ActiveSheet.Paste
'Next time you find a match, it will be pasted in a new row
pasteRowIndex = pasteRowIndex + 1
'Switch back to your table & continue to search for your criteria
Sheets("Sheet1").Select
End If
Next r
columns in sheet1 are changing oftenly. so needs to create Dynamic VBA Macro code.
Please guide me for this query.

Answer 1

For your case, I don't think that you need a macro to manage the drop down list but perhaps data validation will do.
Create a new worksheet,
I got a worksheet contain the following data at column A
At the worksheet that i want the dropdownlist, i just highlight the cell and click on the data validation button at data ribbon
In the data validation, create the following setting
Click on the ok button and the list will be created
Since in the columns in the worksheet(source) keep on changing, you need write the macro to copy the entire needed column exclude the header of the column to next worksheet(e.g. worksheet that create the dropdown list).
Edited: Code to detect the criteria column and copy the column
Option Explicit
Dim MyWorkbook As Workbook
Dim MyWorksheet As Worksheet
Dim MyWorksheet2 As Worksheet
Dim WantedColumn As Long
Dim ColumnPointer As Long
Sub copyCriteria()
Set MyWorkbook = Workbooks(ActiveWorkbook.Name)
Set MyWorksheet = MyWorkbook.Sheets("Sheet6")
Set MyWorksheet2 = MyWorkbook.Sheets("Sheet5")
For ColumnPointer = 1 To MyWorksheet.Cells(1, Columns.Count).End(xlToLeft).Column
If MyWorksheet.Cells(1, ColumnPointer).Value = "ColumnE" Then
MyWorksheet.Columns(ColumnPointer).Copy
MyWorksheet2.Range("A1").PasteSpecial xlPasteValues
Application.CutCopyMode = False
MyWorksheet2.Rows("1:1").Delete Shift:=xlUp
End If
Next
End Sub

Answer 2

What you are trying to do can be done with a simple named range and Data Validation to use that Name. If you have not heard of Dynamic Ranges, then you should read on.
If Sheet1 only has the 1 column for the DropDown list via Data Validation, you should use a Named Range instead of a fixed Range. But this named range is dynamic (by using formula)! See OFFSET usage.
Lets say Sheet1 is like below:
Lets say the name to be used is MyList, then in Excel click Name Manager in Formulas tab, and place in below as the Range Refers to:
=OFFSET(Sheet1!$A$1,0,0,COUNTA(Sheet1!$A:$A))
Now in Sheet2, the Data Validation is placed on B2, when setting it up, once you put in the source to =MyList, Excel highlights it:
Then the drop down list worked:
Now if you add data to your list (Column A on Sheet 1), the MyList automatically expands and hence your DataValidation drop down list!
Note the list will go up to the first blank cell in Column A, so NO GAPS!
Enjoy!