How to delete duplicate column in acces

Question

 

Please write me the required 

(look thet photomdb file name)

 

commandOleDbCommand cmd1 = new OleDbCommand(??????????????????????, connection);cmd1.ExecuteNonQuery();

 

C:\data.mdb

 

table name : muhtasar

 

column name : "a"

 

 

 

 Note :Other forum sites users did not solve the problem : (