Fill Value in DataGridview in C#

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C#

WinForms

Hello friends,

I have a data grid view . And I am filling it with from database.

//code

try
           {
               string query = "Select item_id,subject,team_member,status,department,types_of_graphics,graphics_type,priority,item_mode,in_time,out_time,description from Incident Order By item_id DESC";
               if (con.State == ConnectionState.Closed)
               {
                   con.Open();
               }

               MySqlCommand cmd = new MySqlCommand();
               //      cmd.CommandType = CommandType.StoredProcedure;
               cmd.CommandText = query;
               cmd.Connection = con;

               MySqlDataAdapter da = new MySqlDataAdapter(cmd);
               DataTable dt = new DataTable();
               da.Fill(dt);
               if (dt.Rows.Count > 0)
               {
                   dgHelpDesk.Refresh();
                   dgHelpDesk.DataSource = dt;

                   //show_description();
               }
               else
               {
                   dgHelpDesk.Refresh();
               }
           }
           catch (Exception ex)
           {
               MessageBox.Show(ex.Message);
           }
           finally
           {

               con.Close();
           }

But There are two column in datagridview in which My need is change value Format. So how can I change Here. //

Encoding.UTF8.GetString(Convert.FromBase64String(dgHelpDesk.Rows[a].Cells["subject"].Value.ToString()))

// Can I change a particular cell Encoding??