TryParse misguides for 10digits entry

Question

5.00/5 (1 vote)

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I use VS2008. In the following code, 'TryParse' works well when I enter upto 9 digits. When I enter 10 digits it is reflecting 'false'.

C#

int value;
           if ( Int32.TryParse(TextBox17.Text, out value) == false)
           {
               v_MyAddressPhoneTag = "";
               Label22.Visible = true;
               RBL7clear();
           }
           else
           {
               v_MyAddressPhoneTag = "*";
               Label22.Visible = false;

           }

XML

<asp:TextBox ID="TextBox17" runat="server"  OnTextChanged="TextBox17_TextChanged"  AutoPostBack="true" MaxLength="10"
   style=" z-index: 1;top: 182px; left: 212px; position: absolute; height: 18px; width: 148px"></asp:TextBox>

Posted 25-Nov-13 22:50pm

S.Rajendran from Coimbatore

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4 solutions

Solution 1

you are most likely hitting the max.value limit for integer values. use a longer integer (Int64 (Long) or if you really need a BigInteger

Posted 25-Nov-13 22:59pm

johannesnestler

Solution 3

Try the sample code given in this link and you will find out the exact problem with your code.
http://msdn.microsoft.com/en-us/library/system.int32.maxvalue(v=vs.110).aspx[^]

Posted 25-Nov-13 23:04pm

Thomas ktg

Solution 4

hi if u value is greater than 2147483647, then it will return false..

below properties for Int32

C#

// Summary:
       //     Represents the largest possible value of an System.Int32. This field is constant.
       public const int MaxValue = 2147483647;
       //
       // Summary:
       //     Represents the smallest possible value of System.Int32. This field is constant.
       public const int MinValue = -2147483648;

below properties for Int64

C#

// Summary:
        //     Represents the largest possible value of an Int64. This field is constant.
        public const long MaxValue = 9223372036854775807;
        //
        // Summary:
        //     Represents the smallest possible value of an Int64. This field is constant.
        public const long MinValue = -9223372036854775808;

Choose based on ur requirement..

Posted 25-Nov-13 23:18pm

Karthik_Mahalingam

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**Zoltán Zörgő** · Accepted Answer · 2013-11-25T23:01:00

Solution 2

You should not treat phone numbers as integer. They are syntactically numbers, but nobody is interested in their numerical value. Use string instead.
Int32's max value[^] is 2,147,483,647. It looks ten digit long but it is not, since it is 32 bit long, thus numbers greater than this value won't fit.

You could use Int64, but you should not.

Posted 25-Nov-13 23:01pm

Zoltán Zörgő

v2

Comments

S.Rajendran from Coimbatore 26-Nov-13 5:14am

Thanks.