Export Binry Data from Database to gridview

private void InsertIntoDB()
    {
	int count=0;

        SqlConnection con = new SqlConnection("DataBase=ENGSOFT;User Id=sa;Password=P@ssword9");
        try
        {            
            con.Open();
            SqlCommand cmd;
            DataTable dt = Session["Table"] as DataTable;

		
            if (dt.Rows.Count > 0)
            {
		   //Read each and everyrow of datatable and insert each and every row to SQL DataBase.
                foreach (DataRow dr in dt.Rows)
                {
                    string Ename = dr["ENAME"].ToString();
                    string Job = dr["JOB"].ToString();
                    string MGR = dr["MGR"].ToString();
                    string Sal = dr["SAL"].ToString();
                    string comm = dr["COMM"].ToString();

			//normal insert query.

                    cmd = new SqlCommand("INSERT INTO EMP(ENAME,JOB,MGR,HIREDATE,SAL,COMM,DEPTNO) VALUES(@ename,@job,@mgr,@hiredate,@sal,@comm,@deptno)", con);
                    cmd.Parameters.AddWithValue("@ename", Ename);
                    cmd.Parameters.AddWithValue("@job", Job);
                    cmd.Parameters.AddWithValue("@mgr", MGR);
                    cmd.Parameters.AddWithValue("@hiredate", DateTime.Now);
                    cmd.Parameters.AddWithValue("@sal", Sal);
                    cmd.Parameters.AddWithValue("@comm", comm);
                    cmd.Parameters.AddWithValue("@deptno", "1");

                    int n = cmd.ExecuteNonQuery();
			count = count + n;

                }
            }
        }
        catch (Exception ex)
        {
        }
        finally
        {
            con.Close();
            con.Dispose();
            lblResult.Text = count + " Records Inserted Successfully...!!!";
        }
    } 

http://www.csharpstar.com/csharp-program-to-convert-binary-string-to-integer/

 if (cell.Value.GetType() == typeof(Bitmap))
{
     string imagString = "bitmap1.bmp";
    Excel.Range oRange = (Excel.Range)xlWorkSheet.Cells[i + 1, j + 1]; 
    float Left =(float) ((double)oRange.Left);
    float Top =(float) ((double)oRange.Top);
    const float ImageSize=32;
    xlWorkSheet1.Shapes.AddPicture(imagString, Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoCTrue, Left, Top, ImageSize, ImageSize);
    oRange.RowHeight = ImageSize + 2;
}
else
{
    xlWorkSheet.Cells[i + 1, j + 1] = cell.Value;
}