Input string was not in a correct format.(string to float coversion in ASP.NET)

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I have 3 inputs like 3 subject marks,I want Store totalmarks(float) and Averagemarks(float) in database.I am getting an error like above "Input string was not in a correct format".

Actually That Excat Code Line By Line Code Execute in my previous Example.

Now that previous Pgm I am Extended with Dropdownlist and gridview.But its not working present pgm.can any one Explain whats the problem,plz solve my issue As soon As possible..
Thanks in Advance

What I have tried:

float m1 =float.Parse(txtm1.Text);
float m2 = float.Parse(txtm2.Text);
float m3 = float.Parse(txtm3.Text);
float totmarks = m1 + m2 + m3;

//SAvgmarksarks
float Avgmarks = totmarks / 3;

Posted 20-Jun-18 21:21pm

BNB-GOWD

Updated 20-Jun-18 21:49pm

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jsc42 · Answer 1 · 2018-06-20T21:44:00

Solution 1

Instead of using Parse, try using TryParse. See Double.TryParse Method (String, NumberStyles, IFormatProvider, Double) (System)[^]

Posted 20-Jun-18 21:44pm

jsc42

OriginalGriff · Answer 2 · 2018-06-20T21:50:00

Solution 2

Never assume that users will type the right data - always convert it using TryParse (or TryParseExact in some cases).

C#

float m1;
if (!float.TryParse(txtm1.Text, out m1))
   {
   ... report input error to user ...
   return;
   }

Posted 20-Jun-18 21:50pm

OriginalGriff