C# window application

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hi,
i go through a problem in which if i deleted the value of textbox first then it will show an error of :input string is not in correct format". but if the default value which is zero, updated without delete it will works but if i delete default value it will shoe an error.

C#

private void txtAddPtechDetSplPay_TextChanged(object sender, EventArgs e)
{
if (!string.IsNullOrEmpty(txtAddPtechDetDA.Text) || string.IsNullOrEmpty(txtAddPtechDetAcaAlwnc.Text) || string.IsNullOrEmpty(txtAddPtechDetTotPay.Text) || string.IsNullOrEmpty(txtAddPtechDetHRA.Text))
{
double i = Convert.ToDouble(txtAddPtechDetDA.Text) + Convert.ToDouble(txtAddPtechDetAcaAlwnc.Text) + Convert.ToDouble(txtAddPtechDetTotPay.Text) + Convert.ToDouble(txtAddPtechDetHRA.Text) +

}
}

i think when we delete the default value so this function get null for this textbox. but it will work for some textboxes properly. please help me out

Posted 5-Nov-12 18:42pm

Member 8172875

Updated 5-Nov-12 18:44pm

sinhasourabh

v2

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Sergey Alexandrovich Kryukov · Answer 1 · 2012-11-05T19:00:00

With all you checks, you cannot guarantee valid double floating point format in all cases. So, no matter what logic you want to apply, use double.TryParse instead of Convert:
http://msdn.microsoft.com/en-us/library/system.double.aspx[^].

"Convert" is a bad word for that, this is really parsing, not "conversion"...

—SA