C#: Fix error System.NullReference Exception occurred when insert all rows datagridview to database

C#: Fix error System.NullReference Exception occurred when insert all rows datagridview to database

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Solve error dataType argument cannot be null when add cloumns in datagridview C#
Solve error dataType argument cannot be null when add cloumns in datagridview C#
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Solve error dataType argument cannot be null when add cloumns in datagridview C#

Solve error dataType argument cannot be null when add cloumns in datagridview C#
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