c# - Read the column value extract the substring and over write the substring value -


i copying data 1 excel sheet compare. need date in columns date plus time present. write code iterate through column fetch substring , write . tried code 

        int ncolumns = ws2.usedrange.columns.count;         int nrows = ws2.usedrange.rows.count;          (int = 3; < nrows; i++)         {             (int j = 2; j < ncolumns; j++)             {                 string order_date = ws2.columns[i, "a" + j];                 string order_date_2 = order_date.substring(9);                 ws2.columns[i, "a2"] = order_date_2;             }         }


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