Null Array

I have a value that I am splitting into an array. When the value is null, it gives me an error message. How can I prevent the error message when the value is null.
                        string PhoneNum = reader["PhoneNumber"].ToString();
                        string[] strArr = PhoneNum.Split('-');
                        PersonPhoneNumber1.Value = strArr[0];
                        PersonPhoneNumber2.Value = strArr[1];
                        PersonPhoneNumber3.Value = strArr[2];   

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RecipeDanAsked:
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it_saigeConnect With a Mentor DeveloperCommented:
Another possibility is that reader["PhoneNumber"] represents a null value in which case you would use the following in conjunction with Miguels code:
string PhoneNum = reader["PhoneNumber"] != null ? reader["PhoneNumber"].ToString() : string.Empty;
if (!String.IsNullOrEmpty(PhoneNum))
{
	String[] Strarr = Phonenum.Split('-');
	Personphonenumber1.Value = Strarr[0];
	if (Strarr.Length > 1) 
		Personphonenumber2.Value = Strarr[1];
	if (Strarr.Length > 2) 
		Personphonenumber3.Value = Strarr[2];
}
//else set default values

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-saige-
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Miguel OzConnect With a Mentor Software EngineerCommented:
I assume PhoneNum is empty.
If it is, please modify code to check for empty as follows:
  string PhoneNum = reader["PhoneNumber"].ToString();
  if (!String.IsNullOrEmpty(PhoneNum))
  {
	String[] Strarr = Phonenum.Split('-');
	Personphonenumber1.Value = Strarr[0];
        if (Strarr.Length > 1) 
	     Personphonenumber2.Value = Strarr[1];
        if (Strarr.Length > 2) 
	     Personphonenumber3.Value = Strarr[2];
  }
 //else set default values

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RecipeDanAuthor Commented:
Thank you both for your assistance.
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