wpf验证组合框文本框

问题描述

There are 2 comboboxes and 2 textboxes in my wpf project.
I want to set fill in validation.
It says "Fill in properly" even I fill them properly.
Below is my code:
        private void Reg()
        {
            if (txtDate.Text != null & txtTime.Text != null & cmbGroup1.SelectedIndex > 0 & cmbName1.SelectedIndex > 0)
            {
                MySqlConnection con = new MySqlConnection(constr);
                MySqlCommand cmd = new MySqlCommand("INSERT INTO Regiter(Date,Time,Image_ID,Students_ID) "
                    + "VALUES ('" + txtDate.Text + "','" + txtTime.Text + "','" + getMaxRasmID() + "','" + getStudentsID() + "')", con);
                con.Open();
                int i = cmd.ExecuteNonQuery();
                if (i > 0)
                {
                    MessageBox.Show("Registered");
                }
                con.Close();
            }
            else
            {
                MessageBox.Show("Fill in properly");
            }

        }

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