error in comboboxselectedindexedchangedevent in c#

Question

1.00/5 (1 vote)

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Hello friends,
this is my code.

XML

private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
       {
           comp.CLASSID = Convert.ToInt32(comboBox2.SelectedValue.ToString());
           comp.ACADAMICYEAR = textBox1.Text;
           List<string> result = inter.getSectionforsetting(comp);
           comboBox3.DataSource = result;
       }

the error is

Input string was not in a correct format.

but
when i enter the above code in combobox2_leave event it actually run without any error.
what is the error

Posted 2-Jan-13 1:51am

baskaran chellasamy

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Comments

Sanjay K. Gupta 2-Jan-13 8:11am

Reason :- value of "comboBox2.SelectedValue.ToString()" is non-numeric.
Rest is up to you.

baskaran chellasamy 2-Jan-13 8:20am

if it is non numeric then how can it accept numeric value in comboboxleave event

Alan N 2-Jan-13 12:25pm

First step is accepting that the error message is correct. Second is finding out what the actual value is by viewing it with the debugger. If you don't understand why the string has that value then ask by editing your questionto include the new information.

DR Delphi 6-Jan-13 12:21pm

Please share what the error message is.. we are not mind readers and cannot possible know what the value of the comp.CLASSID = Convert.ToInt32(comboBox2.SelectedValue.ToString()); is what if you have the value of the SelectedValue.ToString() as 'ABC' ? it will ERROR.. so personally I would would either run a prior check to make sure that the value being selected is numeric also you can look at the Parse() Method..

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