Copy datatable to SQL table

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C#

Hi dears,

I have created one datatble called temp.

and it is having some values, when i give temp as datasource for grid view, then the value is populating. But when i copy the same to my database table using SQLbulkcopy, I am getting the below error in line--

sbc.writetoserver(temp);

"object reference not set to an instance object"

Actually its popping up as an exception.

What I have tried:

datatable temp is having values.
double checked "con" is my sql connectionstings name.
home.global.mon ----> table name taking from a global variable.

using(sqlbulkcpoy sbc =new sqlbulkcop(con))
{
sbc.destinationtable=home.global.mon;
 sbc.writetoserver(temp); // Getting error here 
con.close();
}