'string' does not contain a definition for 'IsNullOrWhiteSpace' how to solve this error?

Question

4.00/5 (1 vote)

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hi,

Can anyone know.

it show error like ,'string' does not contain a definition for 'IsNullOrWhiteSpace' how to solve this error?

C#

public object SQLExecuteNonQuery(string procedureName, Hashtable cmdParms)
   {
       try
       {
           _SqlConnection = GetSQLConnection();
           //Open SQL Connection
           _SqlConnection.Open();
           _SqlCommand = new SqlCommand(procedureName, _SqlConnection);

           _SqlCommand.CommandType = CommandType.StoredProcedure;
           //null or empty checking procdure name and hashtable
           if (cmdParms.Count > 0 && !string.IsNullOrWhiteSpace(procedureName))
           {
               foreach (DictionaryEntry de in cmdParms)
               {
                   //adding sql parameter
                   _SqlCommand.Parameters.Add(new SqlParameter(de.Key.ToString(), de.Value));
               }

           }
           //Executing SQl Command
           return _SqlCommand.ExecuteScalar();
       }

Posted 7-Feb-12 23:13pm

sathiyak

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3 solutions

Solution 3

String.IsNullOrWhiteSpace has been introduced in .NET 4. If you are not targeting .NET 4 you could easily write your own:

C#

public static class StringExtensions
{
    public static bool IsNullOrWhiteSpace(string value)
    {
        if (value != null)
        {
            for (int i = 0; i < value.Length; i++)
            {
                if (!char.IsWhiteSpace(value[i]))
                {
                    return false;
                }
            }
        }
        return true;
    }
}

which could be used like this:

bool isNullOrWhiteSpace = StringExtensions.IsNullOrWhiteSpace("foo bar");

Posted 7-Nov-12 18:01pm

Maddy selva

Updated 7-Nov-12 18:02pm

v2

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Herman<T>.Instance · Accepted Answer · 2012-02-07T23:16:00

Solution 1

string.IsNullOrWhiteSpace was added to .net framework 4.0 and up. So you must be using older version of .net framework. Set the appropriate .net framework in your project settings. See here[^].

Posted 7-Feb-12 23:16pm

Herman<T>.Instance

Comments

Espen Harlinn 8-Feb-12 9:25am

5'ed!

Tech Code Freak 8-Feb-12 12:45pm

5up!

Abhinav S · Accepted Answer · 2012-02-07T23:17:00

Solution 2

Looks like you are trying to build code in an older version of .Net.
Anything before .Net 4.0 does not support this method.

Posted 7-Feb-12 23:17pm

Abhinav S

Comments

Espen Harlinn 8-Feb-12 9:25am

5'ed!

Abhinav S 8-Feb-12 9:28am

Thanks.

Tech Code Freak 8-Feb-12 12:45pm

5up!