i retrieved the column name from the data base to the DGV

i retrieved the column name from the data base to the data grid view.


 design as follows at run time in data grid view ;

 Date     Session   colname colname colname colname colname
 7/1/12     1
 7/1/12     2
 7/1/12     3
 7/1/12     4
 7/1/12     5

in the run time in the column name faculty name is retrieved from the data base.that is working fine.

Here Total Column is 7.

Data base record as follows;

 date    session  faculty name
 7/1/12     1      G Sekar
 7/1/12     2      R suresh   
 7/1/12     3      V Raju
 7/1/12     4      m Murali
 7/1/12     5      R Joshi

suppose when i  add one record in the data base  total record as follows;

 date    session  faculty name
 7/1/12     1      G Sekar
 7/1/12     2      R suresh   
 7/1/12     3      V Raju
 7/1/12     4      m Murali
 7/1/12     5      R Joshi
 8/1/12     1      R Ram

BUTTON CODE AS FOLLOWS;
con.Open();
SqlCommand cmd = new SqlCommand("select Faculty_Name from Tb_SCH_Faculty_Details Where  Active <> 'D' ", con);
           SqlDataReader dr = cmd.ExecuteReader();
           int j = 2;
           while (dr.Read())
            {
                datagridView.Columns[j].HeaderText = dr[0].ToString().Trim();
                j++;
            }
            dr.Close();
            con.Close();

that  time when i click the BUTTON ERROR SHOWS AS FOLLOWS;

Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name:


please help me.from the button code please correct  it,  i tried.