How to give the For Loop for 3 work sheets?

[Uma]

Hi,
I am opening a excel sheet from QTP.
This is my following code.

Code:

Set xlWrkbk = xlApp.Workbooks.Open("C:\New Folder\RETS.xls")
Set xlWrksht = xlWrkbk.Worksheets("MD")
Set xlWrksht1 = xlWrkbk.Worksheets("Obj")
Set xlWrksht2 = xlWrkbk.Worksheets("Sea")
'Metadat is the name of the  Excel sheet
intStartRow=1
'Declare the starting row
For intRow = intStartRow to xlWrksht.UsedRange.Rows.Count

Gmd= xlWrksht.Range("A" & intRow)
ID = xlWrksht.Range("B" & intRow)
Format  = xlWrksht.Range("C" & intRow)
Res= xlWrksht1.Range("A" & intRow)
Type1 = xlWrksht1.Range("B" & intRow)
ID1= xlWrksht1.Range("C" & intRow)
...............
Next

In the for loop I am asking to check the rows in the sheet

For

Code:

intRow = intStartRow to xlWrksht.UsedRange.Rows.Count

It checks all the 4 rows and it displays the correct result.

If it work with the 2nd and 3rd sheet it doesnot work properly.
It checks all the rows and again it tries to get inside and
giving invalid procedure call or argument error.

How to solve it?Any idea?

Thanks,
Uma