Input string was not in a correct format

Question

1.00/5 (1 vote)

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Whan i used Convert.double() it brought an error 'System Convert' does not contain a definition for 'Double'
i had to change to Convert.Todouble() but it Still brings up the same error of "Input string was not in a correct format"

What is really the problem. Can u still provide help. See the code below how i did.

C#

Private void AmountPaid_TextChanged(object sender, system.EventArgs e)
{
double Balance;
double Amount1 = Convert.double(this.Amount.text);
double Amount2= Convert.double(this.AmountPaid.text);
Balance = Amount1 - Amount2;
}

Posted 20-Jul-11 23:45pm

ssempijja

Updated 15-Oct-19 7:49am

walterhevedeich

v2

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Comments

walterhevedeich 21-Jul-11 5:52am

Paste the exact code. There's no Convert.double, from what I know.

[no name] 15-Oct-19 13:42pm

If taking user input, you need to validate that the input you received is numerical only, and if the values are in fact doubles. And you can do this with Double.TryParse, see my answer.

6 solutions

Solution 3

Convert.ToDouble Method needs to know how to information's about the decimal and group separator. If this separators are different then the one used by default, u need to indicate the proper culture or create the custom culture for that conversion.

Then you should use the following method to convert it http://msdn.microsoft.com/en-us/library/9s9ak971.aspx[^]

At the end of the indicated page, there is also a nice example of how to achieve that.

Hope it helps

Cheers

Posted 20-Jul-11 23:53pm

Mario Majčica

Solution 5

You will get this error Amount.text or AmountPaid.text is empty. To avoid this error you have to check the empty before assigning and you have to Convert.ToDouble.

double Amount1 = Convert.ToDouble(this.Amount.text == "" ? 0 : this.Amount.text);
double Amount2= Convert.ToDouble(this.AmountPaid.text == "" ? 0 : this.AmountPaid.text);

Posted 20-Jul-11 23:57pm

Toniyo Jackson

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Pete O'Hanlon · Accepted Answer · 2011-07-20T23:51:00

C# is case sensitive. It should be Convert.ToDouble not Convert.double if you want to use this particular calling convention. A better method would be to use the TryParse method which lets you convert the value if it's in an acceptable format, without triggering an exception if it's not. Try rewriting this method like this:

C#

double balance;
double amount1;
double amount2;

if (!double.TryParse(Amount.Text, out amount1))
{
  return 0;
]
if (!double.TryParse(AmountPaid.Text, out amount2))
{
  return 0;
}

balance = amount1 - amount2;

One thing though - you have declared balance locally, and you aren't doing anything. Effectively this method is performing a calculation for no reason right now.

OriginalGriff · Accepted Answer · 2011-07-20T23:56:00

Try:

Private void AmountPaid_TextChanged(object sender, system.EventArgs e)
   {
   double Balance;
   double Amount1 = Convert.ToDouble(this.Amount.Text);
   double Amount2 = Convert.ToDouble(this.AmountPaid.Text);
   Balance = Amount1 - Amount2;
   }

Or:

Private void AmountPaid_TextChanged(object sender, system.EventArgs e)
   {
   double Balance;
   double Amount1 = Double.Parse(this.Amount.Text);
   double Amount2 = Double.Parse(this.AmountPaid.Text);
   Balance = Amount1 - Amount2;
   }

If your users can enter non-numeric data, then you need to look at TryParse instead:

Private void AmountPaid_TextChanged(object sender, system.EventArgs e)
    {
    double Balance;
    double Amount1;
    double Amount2;
    if (Double.TryParse(Amount.Text, out Amount1) && Double.TryParse(AmountPaid.Text, out Amount2))
        {
        Balance = Amount1 - Amount2;
        }
    }

Raju Prajapati · Accepted Answer · 2011-07-21T00:11:00

Try this

C#

using System.Text.RegularExpressions;
Private void AmountPaid_TextChanged(object sender, system.EventArgs e)
{
  Regex regex = new Regex("^[0-9]*$");
  if (regex.IsMatch(this.AmountPaid.Text) && !string.IsNullOrEmpty(this.AmountPaid.Text.Trim()))
            {
                double Balance;
                double Amount1 = Convert.ToDouble(this.Amount.text);
                double Amount2 = Convert.ToDouble(this.AmountPaid.text);
                Balance = Amount1 - Amount2;
                
            }
}

shefeekcm · Accepted Answer · 2011-07-20T23:51:00

Solution 1

Hi,
use this

C#

Private void AmountPaid_TextChanged(object sender, system.EventArgs e)
{
double Balance;
try
{
double Amount1 = Convert.ToDouble(string.Format("{0:0.00}", Amount.text));
double Amount2= Convert.ToDouble(string.Format("{0:0.00}", AmountPaid.text));
}
catch(Exception)
{
}
Balance = Amount1 - Amount2;
}

Posted 20-Jul-11 23:51pm

shefeekcm

Updated 21-Jul-11 0:16am

v3

Comments

shefeekcm 21-Jul-11 6:17am

check this.

ssempijja 21-Jul-11 7:00am

This is the error am getting:
================================
Compiler Error Message: CS0117: 'System.Web.UI.WebControls.TextBox' does not contain a definition for 'text'

Source Error:

Line 152: try
Line 153: {
Line 154: double Amount1 = Convert.ToDouble(string.Format("{0:00}",Amount.text));
Line 155: double Amount2= Convert.ToDouble(string.Format("{0:00}",AmountPaid.text));
Line 156: }

Source File: e:\KSDAHC\App_Code\Accounts\AddAccountsPage.Controls.cs Line: 154

====================================
these are the declarations stameents am using

using Microsoft.VisualBasic;
using BaseClasses.Web.UI.WebControls;
using System;
using System.Collections;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using BaseClasses;
using BaseClasses.Data;
using BaseClasses.Utils;
using ReportTools.ReportCreator;
using ReportTools.Shared;