文本框处理不工作

我正在使用C#和Visual Studio 2005。

    void tbb_KeyPress(object sender, KeyPressEventArgs e)
    {
        if ((Keys)e.KeyChar == Keys.Enter)
        {
            listBox2.Visible = false;
            button4.Visible = false;
            if (tbb.Text!="")
            {
                bb.Visible = true;
                bb.Focus();
            }
            else
            {
                //tbb.Visible = false;
                tbb.Dispose();
                bb.Dispose();
                textBox2.Visible = true;
                textBox2.Focus();
            }
        }
    }

private void textBox2_KeyPress(object sender, KeyPressEventArgs e)
{
    if ((Keys)e.KeyChar == Keys.Enter)
    {
        if (bb.Text == "")
        {
            MessageBox.Show("Sorry Empty.Row");
            this.flowLayoutPanel1.Controls.Clear();
            label13.Text = "";
            textBox1.Text = "";
            textBox2.Text = "";
            maskedTextBox1.Text = "";
            maskedTextBox1.Enabled = true;
            maskedTextBox1.Focus();
            textBox1.Enabled = true;
        }
        else
        {
            string connstr = "server=.;initial catalog= maa;uid=mah;pwd=mah";
            SqlConnection con = new SqlConnection(connstr);
            con.Open();

            SqlCommand cmd1 = new SqlCommand("insert into debankA(companyID,transID,date,bank,totdepo,narrat) values " +
            "(@companyID,@transID,Convert(datetime,'" + maskedTextBox1.Text.ToString() + "',103),@bank,@totdepo,@narrat)", con);
            cmd1.Parameters.Add("@bank", SqlDbType.VarChar).Value = textBox1.Text;
            cmd1.Parameters.Add("@totdepo", SqlDbType.Decimal).Value = label13.Text;
            cmd1.Parameters.Add("@narrat", SqlDbType.VarChar).Value = textBox2.Text;
            cmd1.Parameters.Add("@companyID", SqlDbType.Int).Value = label6.Text;
            cmd1.Parameters.Add("@transID", SqlDbType.Int).Value = textBox4.Text;
            cmd1.ExecuteNonQuery();

            string pparticulars = null;
            double? depo = null;
            string messs = "Record Save Successfully";
            foreach (Control ctl in this.flowLayoutPanel1.Controls)
            {
                if (ctl.Name.Contains("tbb") && ctl is TextBox)
                {
                    pparticulars = ctl.Text;
                }

                if (ctl.Name.Contains("bb") && ctl is TextBox)
                {
                    double ddepo = 0;

                    if (double.TryParse(ctl.Text, out ddepo))

                        depo = ddepo;

                    if (pparticulars != null && depo != null)
                    {
                        SqlCommand cmd = new SqlCommand("insert into debankB(particulars,deposit,companyID,transID)values" +
                        "(@particulars,@deposit,@companyID,@transID)", con);
                        cmd.Parameters.Add("@particulars", SqlDbType.VarChar).Value = pparticulars;
                        cmd.Parameters.Add("@deposit", SqlDbType.Decimal).Value = depo;
                        cmd.Parameters.Add("@companyID", SqlDbType.Int).Value = label6.Text;
                        cmd.Parameters.Add("@transID", SqlDbType.Int).Value = textBox4.Text;
                        cmd.ExecuteNonQuery();
                        pparticulars = null;
                        depo = null;

                        MessageBox.Show(messs);
                        messs = null;
                        this.flowLayoutPanel1.Controls.Clear();
                        label13.Text = "";
                        textBox1.Text = "";
                        textBox2.Text = "";
                        maskedTextBox1.Text = "";
                        maskedTextBox1.Enabled = true;
                        maskedTextBox1.Focus();
                        textBox1.Enabled = true;
                    }

即使我已经处理了两个空文本框消息始终只显示“空。记录“如上我所说。

这意味着空文本框不会被处理。但如果这是真的,那么当我运行应用程序并创建了文本框,其中的数据是可用的,它保持不变,空文本框是不可见的。按回车键。

我不明白是什么问题。如果文本框在运行时被释放,那么它如何显示为空?