how to solve this error Object cannot be cast from DBNull to other types.

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how to solve this error Object cannot be cast from DBNull to other type iam using orcle sqldeveloper as backend.

com_id=Convert.ToInt32(ds.Tables[0].Rows[0]["COMPANYID"]);
hear in my COMPANYID coloumn i have blank data. so i got this error. how to resolve it.
help me please

Posted 26-Oct-15 18:57pm

Rams@music

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Thanks7872 27-Oct-15 1:39am

If you have blank data and getting error,what help do you need from us? Make such that there is something when you convert it. Another way is to use ternary operator to check if it is blank.

2 solutions

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Maciej Los · Accepted Answer · 2015-10-26T21:14:00

There's at least few possible ways:
1) Using Nullable Types (C# Programming Guide)[^]

C#

//declare nullable integer value
int? myValue = ds.Tables[0].Rows[0]["COMPANYID"];
if (myValue!=null)
{
   //proceed
}

2) Using lambda expressions[^] with DbNull.Value[^]:

C#

int result = ds.Tables[0].Rows[0]["COMPANYID"] == DbNull.Value ? 0 : Convert.ToInt32(ds.Tables[0].Rows[0]["COMPANYID"]);

3) Using Int32.TryParse method[^]:

C#

int result = 0;
if(Int32.TryParse(ds.Tables[0].Rows[0]["COMPANYID"], result))
{
    //result has been succesfully converted into integer value
}

Try!

Umarfarukh7 · Accepted Answer · 2015-10-26T19:53:00

Solution 1

Check this out-

C#

com_id = Convert.IsDBNull(ds.Tables[0].Rows[0]["COMPANYID"]) ? 0 : Convert.ToInt32(ds.Tables[0].Rows[0]["COMPANYID"]);

here if DBNull, com_id can be assigned with some default value which could be handled later.

Posted 26-Oct-15 19:53pm

Umarfarukh7

Updated 26-Oct-15 19:54pm

v2

Comments

Rams@music 27-Oct-15 2:46am

thank u this is working
and iam try with this. i got result but yours is more preferable
if(ds.Tables[0].Rows[0]["COMPANYID"].ToString()=="")
{
com_id = 0;
}
else
{
com_id=Convert.ToInt32(ds.Tables[0].Rows[0]["COMPANYID"]);
}