Combo Box inside DataGrid View...Binding Problem

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C#2.0

C#

I have a Datagrid View with 2nd column with COMBO BOX.....In design itself i binded my values to Combo box...as
A
B
C
D
E
F

But when i binding Values from database table to grid view getting error...I binding table 2nd row values A B A C E ....

while Binding getting error

dataGridView1[1,0].value=Convert.ToString(data_table.Rows[0][1])