optimized code for conversion to nullable integer

Question

I am using below code to convert a string value to integer and set in nullable integer variable only if value is greater then zeor '0'.

NOTE: its working fine but i want experts advice to optimize it and make it a library function.

if (txtdownload.Text.Trim() != "") { int i = 0; int.TryParse(txtdownload.Text, out i); if (i > 0) { pad.Noofdownload = i;//Noofdownload is a property on nullable integer } }

Please help to create a Optimized library function (common function), which i can use for all such a conversion.

Thanks a lot.

NOTE: i have created below library function but its not working for properties as we can't pass properties as a ref.

 public static void getValueFromTextBoxInNullable(string srctext,ref int? dest) { if (srctext.Trim() != "") { int j = 0; int.TryParse(srctext , out j); if (j > 0) { dest = j; } } }

This should be migrated to codereview.stackexchange.com as there is no problem, just a desire for a better version. (I realised this after I answered it) — Alastair Pitts
– Alastair Pitts, Commented Jun 14, 2011 at 6:11

Alastair Pitts · Accepted Answer · 2011-06-14 06:08:02Z

This is an extension method that should do the job:

public static int? ToNullableInt(this string source) { var i = 0; return int.TryParse(source, out i) ? (int?)i : null; }

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