Thank you Comatose,
After i rename it to Grd, the error disappear..
But still, i can't figure out how can it works..
What if my plan being like this..
I have to put first, the value of budget in the txtBudget..
Then, the value in the txtBudget will be reduced by every value in the Grd 8th column..
Then, the balance will be appear in the txtBalance..
Could anybody from 3 of you, tell me the codes to make it work? Sorry if i'm like asking, but i am a beginner VB user..