Rent textbox

Try:

private void txt_tax_TextChanged(object sender, EventArgs e)

{

int a, b, c, d;

if (!int.TryParse(txt_rent.Text, out a) || a < 0)

{

MessageBox.Show("Not a valid number. Please reenter.");

txt_rent.Focus();

return;

}

if (!int.TryParse(txt_tax.Text, out b) || b < 0)

{

MessageBox.Show("Not a valid number. Please reenter.");

txt_tax.Focus();

return;

}

if (b > a)

{

MessageBox.Show("Service tax cannot exceed rent. Please reenter.");

txt_tax.Focus();

return;

}

if (!int.TryParse(txt_tds.Text, out b) || c < 0)

{

MessageBox.Show("Not a valid number. Please reenter.");

txt_tds.Focus();

return;

}

d = a + b;

txt_grossrent.Text = d.ToString();

if (c > d)

{

MessageBox.Show("TDS cannot exceed gross rent. Please reenter.");

txt_tds.Focus();

return;

}

d -= c;

txt_netrent.Text = d.ToString();

}

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