Not able to cast string to int. Error msg: Input string was not in a correct format

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is not a valid value for int32 input string was not in a correct format
unhandled exception. system.formatexception: input string was not in a correct format
exception details: system formatexception: input string was not in a correct format
cannot convert string to int
input string was not in a correct format in c# windows application
restsharp input string was not in a correct format

I havethe following code which outputs the number '40':

Hashtable ht = new Hashtable();
ht.Add("numRooms", pageData.Property["romtotalt"].ToString());
string str = ht["numRooms"].ToString();
lblMigrate.Text = i.ToString();

Then I try to convert the string to an int, and I get an exception / error:

Hashtable ht = new Hashtable();
ht.Add("numRooms", pageData.Property["romtotalt"].ToString());
string str = ht["numRooms"].ToString();
int i = Convert.ToInt32(str);  // <-- This is where it fails I t hink. But why??
lblMigrate.Text = i.ToString();

This is the error message I get:

Server Error in '/' Application.
Input string was not in a correct format.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.FormatException: Input string was not in a correct format.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[FormatException: Input string was not in a correct format.]
   System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +7469351
   System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +119
   development.templates.HotellGuide.btnMigrateHotels_Click(Object sender, EventArgs e) +956
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +111
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +110
   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565


Version Information: Microsoft .NET Framework Version:2.0.50727.3082; ASP.NET Version:2.0.50727.3082 

I don't understand what's wrong. I'va castet string to int multiple times before, and never has this problem occured.

Please help :)

Update

I have found a solution. I have NO idea why this works.... but it works... I put the convertion inside a Try Catch, and now it works. Figure that one out :op

int numRooms = 0;
int numAllergyRooms = 0;

try
{
    numRooms = Convert.ToInt32(newHotel["numRooms"].ToString().Trim());
    numAllergyRooms = Convert.ToInt32(newHotel["numAllergyRooms"].ToString().Trim());
}
catch (Exception ex)
{
    Console.WriteLine("{0} Exception caught.", ex);
}

I think the line "Input string was not in a correct format" explains it all. In the line

 int i = Convert.ToInt32(str);

str might be containing alphabetic characters. Take a look at it while debugging, what does it contain?

Input string was not in a correct format when convert this value 11,74 , "left outer join agents ag on adp.depagentid= ag.agentid " + ToInt32(balance); //<--Input string was not in a correct format. you can not convert your string to int directly // your string has a decimal format string balance = "11  How would I parse an empty string? int.Parse(Textbox1.text) gives me an error: Input string was not in a correct format. System.FormatException: Input string was not in a correct format.


I had the same problem but only try catch method solved my problem

        try
        {
            decimal dPrice=Convert.ToDecimal(sPrice);
            decimal dFreight = Convert.ToDecimal(sFreight);
            decimal dLocalship = Convert.ToDecimal(sLocalship);
            decimal dTarrif = Convert.ToDecimal(sTarrif);
            decimal dBenefit = Convert.ToDecimal(sBenefit);
            decimal dTax = Convert.ToDecimal(sTax);
            decimal dVat = Convert.ToDecimal(sVat);
            decimal dConv = Convert.ToDecimal(sConv);
            decimal factors=(dTarrif+dBenefit+dTax+dVat)/100+1;
            decimal dTotal=(dPrice+dFreight)*dConv;
            dTotal=dTotal*factors;
            string st = Convert.ToString(dTotal);
            e.Row.Cells[iCell].Text = "price is: " + st + " Rials";
        }
        catch(Exception ex)
        {
            Console.WriteLine("{0} Exception caught.", ex);
        }

System.formatexception: input string was not in a correct format, This code is showing error Correct it. The problem is with the input you're trying to feed this line of code. Whatever you're typing at the console cannot be converted to an integer. Don't use the class Convert when it's not really needed​. Parse , or, better, the method not throwing the exception, int. I get this message when running my script, please could you advise how i can overcome the issue so that i should be able to quit the game at any point? Cannot convert value "Q" to type "System.Int32". Error: "Input string was not in a correct format." At C:\Users\F\Documents\Scripts\PowerShell\Test.ps1:58 char:7


You should add Trim() to your code-line where you think it fails. It probably has to do with excessive spaces.

int i = Convert.ToInt32(str.Trim());

Maybe even check to see if str is string.Empty, this will also cause Convert.ToInt32 to crash.

if (string.IsNullOrEmpty(str)) {
    str = "0";
}

3 Ways to Convert String to Int or Number in C#, of the time your code required to convert String into Number or Int. Most of the time after converting you might get input string was not in a correct format error. The log text seems to be an issue with puting a string that is not a number to a number. But that does not say much about what is wrong. Since I am running on Parallels Desktop on mac with Windows 10 I include that here, but I have never run into any issues in Windows before, because I am runnint that application.


The code is ok, but if the str may have white space, so you should remove them before convert:

int i = Convert.ToInt32(str.Replace(" " ,""));  // <-- This is where it fails I t hink. But why??

Sams Teach Yourself ASP.NET in 21 Days, The input string was not in a correct format . the stack trace below to get a better understanding of what the error is and where it originated from in the code . ' Converted the String value 104 to the Int16 value 104. ' The String value 103.0 is not in a recognizable format. ' Converted the String value -1 to the Int16 value -1. ' The String value 1.00e2 is not in a recognizable format. ' The String value One is not in a recognizable format.


It will be that you are trying to convert Nulls or in this case "" (after your .ToString()) to an int.

Try something that will insert an acceptable placeholder for nulls such as -1 shown in the code below.

Convert.ToInt32(newHotel["numAllergyRooms"].ToString().Trim() == "" ? "-1" : newHotel["numAllergyRooms"].ToString().Trim());

Solved: Input string was not in a correct format, Input string was not in a correct format - Unexpected error on parallels desktop on Mac. Mark as For the first time I was able to save and import Excel data without the issue. If it is in a formula, you can cast the string to number with VALUE()  If the input is not a character string, the output has the default collation of the database, and a collation label of coercible-default. For more information, see Collation Precedence (Transact-SQL). To assign a different collation to the output, apply the COLLATE clause to the result expression of the CAST or CONVERT function.


Mastering Windows PowerShell Scripting, You then attempt to add a number value to a string. Since these are two $_ is replaced with the current pipeline, which in this case is the error message. The console will read Error Processing the Command: Cannot convert value "abcd" to type "System.Int32". Error: "Input string was not in a correct format.". In the second​  In practice, you cannot specify all of the above parameters at the same time. For example, CCSID and ENCODING parameters take effect only on string-to-string conversions, while FORMAT applies only to string-numeric and string-datetime conversions (in either direction).


Special Edition Using Visual C++.NET, The placeholder-sn-ne-to-replaced-on-aues. runtime, and if you pass a parameter of the wrong type, there's no compiler to warn you in advance. ArgumentException: Cannot convert hello to System. Double. Parameter name: type ---> System. Format=xception: Input string was not in a correct format. at System. Number. The .NET Framework provides a couple built in ways to convert a C# string to int, or several other numeric datatypes. It is important that you do so in a way that does not throw potential exceptions. Unsafe Ways to Convert a C# String to Int. You can use a couple built in methods, as shown below, to convert a string to int.


C#.NET - Input String Not in a Correct Format, I have written a code in C#. error: Input string was not in a correct formatHere is the code: Could anyone When I used *Convert.double()* it brought an error *'​System Convert' does not contain a this means the conversion was not successful or documented, that they cannot be made into reliable production software. I need how to convert string to integer values, I have Hours:Minutes: Seconds values are String it's convert to integer seconds , I'd tried below expression but i got #ERROR . Function GetformatTimeAdd() as String