problem with adding new columns in jqGrid using jquery

problem with adding new columns in jqGrid using jquery

Hai....

Iam using jqgrid4.4.4 for asp.net application 3.5 ,when iam adding new column for jqgrid ;old data is replacing with newly added column...i want to store previous data in clientside..i need olddata+previously added column+newly added column...kindly help me