Running Total in C#

Question

i want to make a form which is shown all dates total amount

 

Example

100    2-2-20 

200    3-2-20

300    4-2-20

350    4-2-20

400    5-2-20

 

 

i created a page and its have textbox - im trying to show these details from db to visual studio form

just like in text box value vill be shown in 1st textbox 

 

4-2-20 has already writen in label

textbox value shown both equal dates total in 1 textbox = result 650