Hyperlink in excel sheet

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C#3.0

C#

I have some Fetal Vessel names in a list called "ls". I need to populate those values in an excel sheet and create hyperlink for each of them.
These Fetal vessel names are loaded dynamically to the list for each patient.
My problem is when i click on any vessel's hyperlink, the last hyperlink is opening.
am using windows form.
here is my code -

//------------Creating drop down for the values of list--------------
    string list = string.Join(",", ls.ToArray());
    range.Validation.Delete();
    range.Validation.Add(XlDVType.xlValidateList, XlDVAlertStyle.xlValidAlertInformation, XlFormattConditionOperator.xlBetween, list, Type.Missing);
    range.Validation.IgnoreBlank = true;
    range.Validation.InCellDropdown = true; 
//---------------looping through each value and creating hyperlink----------
    foreach (object lst in ls)
    {
        Microsoft.Office.Interop.Excel.Hyperlink hyperlink = (Microsoft.Office.Interop.Excel.Hyperlink)range.Hyperlinks.Add(range, "P:\\"+ PID.Text.ToString() + "\\"+ lst.ToString() + ".avi",Type.Missing, Type.Missing, "" + lst.ToString() + "");
    }