Cross-thread exception

[C# Programming]

hi all

i am developing windows application in c#.net.i am using Socket concept in that.i have used one datagrid . using socket i filled up my data in grid and also i m using timer to update data in some columns of the data grid

now my problem is when i click on to the column of grid and try to wite in that column textbox i get the error for cross-thread invalidoperation

can anybody help into this problem

thanks in advance