Error on selecting datagrid row

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C#

Hello friends,

In my windows form application i have one datagrid and one combobox.
at form load i binded both the combobox and datagrid.
when i change the text of combobox it changes the value in datagrid.
this code i have written in combobox's SelectedIndexChanged event.
but when i select particular row of grid it fires the SelectedIndexChanged event of combobox and gives me error
"Operation is not valid because it results in a reentrant call to the SetCurrentCellAddressCore function."
plz help me why such error occurs. thanks in advance.