Devexpress gridcontrol sum of row cell values in specific column cell

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C#

DevExpress

i am using devexpress gridcontrol and i have table from database and i added 1 column manualy from codebehind :

gridView1.Columns.AddVisible("Total");

i have question how i can give this column valus from summery of rows values like this for example:

Name Value value2 value3 Total
g    13     1       6     20
h     2     2       2      6

What I have tried:

gridView1.SetRowCellValue