how can change the text color of WorkSheet cell. in c#

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C#

MS-Excel

my get_range method is not working then how can change the color of "TEXT" in present in worksheet cell .

additional information copied from comment below

_worksheet.Cells[1, 1] = "Risk Name";

i want to change the color of "risk name" ie.blue font.

additional information copied from comment below 02
i also try to color a ROW of woksheet but when i m trying to do

// _worksheet.get_Range(_worksheet.Cells[1, 1], _worksheet.Cells[1, 8]).Font.Bold = true;

then i am geting the error Object Doest Not contain definition for get_Range