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ERROR:value for column in the table is DBNull

Posted By:      Posted Date: October 24, 2010    Points: 0   Category :ASP.Net


I have a strongly-typed dataset "TABLE" and I am want to retrieve its value..
Sometime the value is NULL. And I am getting an error "The value for column ' PHONE_NO ' in table 'User' is DBNull.

Here what I tried and it failed.. 
object value = userTable[0]. PHONE_NO[0];
string str = (value is DBNull) ? "" : (string)value;

I also tried. 
string str = userTable[0]. PHONE_NO[0] == null ? "" : userTable[0]. PHONE_NO

How can I fix it. 

Thank you


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