How Can I Solve This Problem Input String Was Not In A Correct Format.

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I create one calculation project on windows form application. i created calculation formula based function. it was working good but I have one Error on Run time. If I Type Decimal Values on example(.15). i got an error  Input string was not in a correct format. i pass two input from TAPFPMcal function.
below i give my coding please help me.

C#

public void TAPFPMcal(string FPR, string RPM)
      {


          if (RPM == "")
          {
              DRPM = 0;
          }
          else
          {
              DRPM = Convert.ToDecimal(RPM.ToString());
          }

          if (FPR == "")
          {
              DFPM = 0;
          }
          else
          {
              DFPM = Convert.ToDecimal(FPR.ToString());
          }
          if (DFPM != 0)
          {
              Decimal FEED = 0;
              FEED = (DRPM * DFPM);
              //fpm=I27*G29
              FPM = Math.Round(FEED, 2).ToString();
          }
          else
          {
              FPM = "0.0000";
          }
      }

Posted 3-Sep-14 3:37am

jeevakumar.T

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Richard Deeming · Accepted Answer · 2014-09-03T03:46:00

To avoid the error when an invalid string is passed in, use the decimal.TryParse method[^].

As to why you're getting an error when you pass in ".15", check your regional settings. It's possible that the decimal separator is not the "." character.

Also, since your parameters are already strings, there's no need to call .ToString() on them.

C#

public void TAPFPMcal(string FPR, string RPM)
{
    if (!decimal.TryParse(RPM, out DRPM))
    {
        DRPM = 0;
    }
    if (!decimal.TryParse(FPR, out DFPM))
    {
        DFPM = 0;
    }
    
    if (DFPM != 0)
    {
        decimal FEED = DRPM * DFPM;
        FPM = Math.Round(FEED, 2).ToString();
    }
    else
    {
        FPM = "0.0000";
    }
}