Please help me solve IsNumeric error

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Here is my code. System.convert doesnot contain a defination forIsNumeric. Then what should iuse. Please help me solve this error.

if ((string.IsNullOrEmpty(Request["form_next_lesson_hours"])) | (Convert.IsNumeric(Request["form_next_lesson_hours"])))
errors += "<br>Please enter a next-lesson duration (typically \"1.5\" hours);

Posted 11-Jun-15 23:27pm

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Thomas Daniels · Answer 1 · 2015-06-12T00:01:00

Solution 1

IsNumeric is only a function in VB.NET. In C#, you can use double.TryParse to check whether the input is numeric, and if it is, this method returns true and it stores the converted value in a variable.

C#

double d;
bool isNumeric = double.TryParse(Request["form_next_lesson_hours"], out d);

Posted 12-Jun-15 0:01am

Thomas Daniels