Input string was not in a correct format in asp.net using c#

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Input string was not in a correct format in asp.net using c#

lbl_avg.Text = Math.Round(double.Parse(dr["star"].ToString()), 1).ToString();

Posted 29-Apr-15 19:40pm

2 solutions

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Karthik_Mahalingam · Accepted Answer · 2015-04-29T19:57:00

use Double.TryParse[^] instead of Double.Parse

C#

dr["star"]  // should be having some null/empty or non numeric values.

C#

double value = 0;
          double.TryParse(dr["star"]+"" , out value);
          lbl_avg.Text = Math.Round(value,1).ToString();

Posted 29-Apr-15 19:57pm

Updated 29-Apr-15 20:15pm

v2

Comments

Prakash J 30-Apr-15 2:02am

yes, empty value have

Prakash J 30-Apr-15 2:02am

what can i do give example

Karthik_Mahalingam 30-Apr-15 2:15am

check the updated solution

Abhinav S · Accepted Answer · 2015-04-29T19:59:00

Use TryParse. This will help you avoid this error in case the string is not a double type.

if (Double.TryParse(dr["star"].ToString(), out result)) {
  //Do the conversion
}

Posted 29-Apr-15 19:59pm

Comments

Prakash J 30-Apr-15 2:14am

can you change my above code using try parse

Abhinav S 30-Apr-15 2:32am

Just replace Math.Round(double.Parse(dr["star"].ToString()), 1).ToString(); with the result value you get from TryParse.
Try it out.