javascript - Showing Previous data while adding new data to kendo grid -

i'm using kendo grid contains 2 records, after changed 1 row. changing, changed data going back-end , saving perfectly. while setting updated data grid. showing old value( i.e.,before changed).

example:

olddata = [{col1:1,col2:10,col3:100}]; newdata = [{col1:10,col2:10,col3:100}]; kendogrid.datasource.data(newdata); 

still showing col1 = 1