public partial class Form1
    {

        FbDataAdapter da;
        DataTable dt;
        DataSet ds;

        private void ShowFilter()
        {
            
            if (fbconn.State == ConnectionState.Closed) //если соединение закрыто - откроем его; Перечисление ConnectionState содержит состояния соединения (подключено/отключено)
            {
                fbconn.Open();
            }

            // Транзакция
            FbTransactionOptions fbto = new FbTransactionOptions();
            fbto.TransactionBehavior = FbTransactionBehavior.NoWait |
                 FbTransactionBehavior.ReadCommitted |
                 FbTransactionBehavior.RecVersion;
            FbTransaction fbt = fbconn.BeginTransaction(fbto);

            FbCommand command = new FbCommand("select * From resume", fbconn, fbt);            
            
            da = new FbDataAdapter(command);
            ds = new DataSet();            
            da.Fill(ds, "Result");
            dt = ds.Tables["Result"];

            dataGridView1.AutoGenerateColumns = false;
            dataGridView1.DataSource = dt;

            fbt.Dispose();
        }
        
        private void UpdateFilter()
        {
            // Транзакция
            FbTransactionOptions fbto = new FbTransactionOptions();
            fbto.TransactionBehavior = FbTransactionBehavior.NoWait |
                 FbTransactionBehavior.ReadCommitted |
                 FbTransactionBehavior.RecVersion;
            FbTransaction fbt = fbconn.BeginTransaction(fbto);

            FbCommand command = new FbCommand("UPDATE resume SET resume_link=@resume_link, user_name=@user_name where resumeid=@resumeid", fbconn, fbt);
            
            da = new FbDataAdapter(command);

            command.Parameters.Clear();
            command.Parameters.AddWithValue("@resume_link", tbFilterLink.Text);
            command.Parameters.AddWithValue("@user_name", tbFilterDescr.Text);
            command.Parameters.AddWithValue("@resumeid", dataGridView1.CurrentRow.Cells["resumeid"].Value);

           
            da.UpdateCommand = command;
            da.UpdateCommand.Connection = fbconn;
            
            da.Fill(dt);

            dataGridView1.AutoGenerateColumns = false;            
            dataGridView1.DataSource = dt;
            
            
            

            fbt.Commit();
            fbt.Dispose();

            //ShowFilter();
        }
    }