DBCViewer.FilterForm.button2_Click C# (CSharp) Method

        private void button2_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(textBox2.Text))
            {
                MessageBox.Show("Enter something first!");
                textBox2.Focus();
                return;
            }

            var fi = new FilterOptions((string)listBox2.SelectedItem, (ComparisonType)comboBox3.SelectedItem, textBox2.Text);

            var dt = m_mainForm.DataTable;
            var col = dt.Columns[fi.Column];

            try
            {
                if (col.DataType.IsPrimitive && col.DataType != typeof(float) && col.DataType != typeof(double))
                    if (fi.Value.StartsWith("0x", true, CultureInfo.InvariantCulture))
                        fi.Value = Convert.ToUInt64(fi.Value, 16).ToString(CultureInfo.InvariantCulture);

                Convert.ChangeType(fi.Value, col.DataType, CultureInfo.InvariantCulture);
            }
            catch
            {
                MessageBox.Show("Invalid filter!");
                return;
            }

            listBox1.Items.Add(fi);
        }