code to show image in datagridview in asp.net

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ASP.NET

hey,
i am using oracle9i and c# asp.net code to show image in datagridview and i am set all property in datagridview but this code not show image,

try
       {
          con.Open();
          OracleDataAdapter da = new OracleDataAdapter("select * from sysadm.document"con);
           //OracleDataAdapter da = new OracleDataAdapter("select USERID,DOCUMENT from sysadm.document",con);
           DataSet ds = new DataSet();
           da.Fill(ds,"aaaaa");
           G1.DataSource = ds;
           G1.DataBind();
           con.Close();
       }
       catch
       { con.Close(); }