SQL Server FileStream how to populate the filestream column
con.Open();
  string sql = "INSERT INTO MyFsTable VALUES (@fData, @fName, default)";
  SqlCommand cmd = new SqlCommand(sql, con);
  cmd.Parameters.Add("@fData", SqlDbType.Image, fileData.Length).Value = fileData;
  cmd.Parameters.Add("@fName", SqlDbType.NVarChar).Value = fi.Name;
  cmd.ExecuteNonQuery();
  con.Close();

5: if (FileUpload1.FileContent.Length > 0)
   6: {
   7:     SqlConnection objSqlCon = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
   8:     objSqlCon.Open();
   9:     SqlTransaction objSqlTran = objSqlCon.BeginTransaction();
  10:
  11:     SqlCommand objSqlCmd = new SqlCommand("FileAdd",objSqlCon,objSqlTran);
  12:     objSqlCmd.CommandType = CommandType.StoredProcedure;
  13:
  14:     SqlParameter objSqlParam1 = new SqlParameter("@SystemNumber", SqlDbType.Int);
  15:     objSqlParam1.Value = "1";
  16:
  17:     SqlParameter objSqlParam2 = new SqlParameter("@FileType", SqlDbType.VarChar,4);
  18:     objSqlParam2.Value = System.IO.Path.GetExtension(FileUpload1.FileName);
  19:
  20:     SqlParameter objSqlParamOutput = new SqlParameter("@filepath", SqlDbType.VarChar, -1);
  21:     objSqlParamOutput.Direction = ParameterDirection.Output;
  22:
  23:     objSqlCmd.Parameters.Add(objSqlParam2);
  24:     objSqlCmd.Parameters.Add(objSqlParam1);
  25:     objSqlCmd.Parameters.Add(objSqlParamOutput);
  26:
  27:
  28:     objSqlCmd.ExecuteNonQuery();
  29:
  30:     string Path = objSqlCmd.Parameters["@filepath"].Value.ToString();
  31:
  32:     objSqlCmd = new SqlCommand("SELECT GET_FILESTREAM_TRANSACTION_CONTEXT()", objSqlCon, objSqlTran);
  33:
  34:     byte[] objContext = (byte[])objSqlCmd.ExecuteScalar();
  35:
  36:
  37:     SqlFileStream objSqlFileStream = new SqlFileStream(Path, objContext, FileAccess.Write);
  38:
  39:     objSqlFileStream.Write(buffer, 0, buffer.Length);
  40:     objSqlFileStream.Close();
  41:
  42:     objSqlTran.Commit();