Index was out of range. Must be non-negative and less than the size of collectio

Hi frnds,

I have an array called"List" with 1 item and a gridview "grdWorkingDays" with two columns.

In the First column, I want to display the working days dynamically from the arraylist and in the second column I need to display a dropdown with CL/PL/Halfday(Which has values from a database table and is already written in a method) against each date of array list.

The code is:

int NoOfWorkingDays = List.Count;            
for (int j = 0; j < NoOfWorkingDays; j++){
  String Date = ((Label)grdWorkingDays.Rows[j].Cells[0].FindControl("lblLeaveType")).Text;
  Date = List[j].ToString();
  DropDownList ddl = (DropDownList)grdWorkingDays.Rows[j].Cells[1].FindControl("cboLeaveType");
  FillLeaveTypeDropdown(ddl);}
public void FillLeaveTypeDropdown(DropDownList ddl)    {
        SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["connectionString"]);
        SqlCommand cmd = new SqlCommand();        SqlDataReader sdr;        
        cmd.Connection=con;        con.Open();
        cmd.CommandText="select leaveid,type from leave_type";
        sdr = cmd.ExecuteReader();                       while (sdr.Read())
        {            ListItem lst = new ListItem();            
            lst.Value = sdr[0].ToString();
            lst.Text = sdr[1].ToString();            
            ddl.Items.Add(lst);                   }    }

When I run this, I am getting error as:

"Index was out of range. Must be non-negative and less than the size of the collection." pointing to the 1st row of for loop.

I am struggling with this for past few days and count find what the error is.

FYI, the array count is being calculated correctly as "1" .