Change MS Excel Row Colour in Excel using C# -

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i creating small program allow user input data windows form. once data has been input form added excel document using oledb.

i have no problems above section , can input data no bother problem comes when try change colour of excel row.

i looking change colour of row red if row has no fill.

the code using:

        excel.application application = new excel.application();         excel.workbook workbook = application.workbooks.open(@"c:\users\jhughes\desktop\screenupdate.xls");         excel.worksheet worksheet = (excel.worksheet)workbook.sheets["dailywork"];         excel.range usedrange = worksheet.usedrange;         excel.range rows = usedrange.rows;         try         {             foreach (excel.range row in rows)             {               if (row.cells.entirerow.interior.colorindex = 0)               {                  row.interior.color = system.drawing.color.red;               }             }         }         catch(exception ex)         {             messagebox.show(ex.tostring());         }

i getting error "cannot implicitly convert type int bool" @ line "if(row.cells.entirerow....)"

i think not added saving workbook , change in if condition. somehow default colorindex coming -4142. tested able change change color

excel.application application = new excel.application();                 excel.workbook workbook = application.workbooks.open(@"c:\users\mypath\desktop\colorbook.xls");                 excel.worksheet worksheet = (excel.worksheet)workbook.sheets["dailywork"];                 excel.range usedrange = worksheet.usedrange;                 excel.range rows = usedrange.rows;                 try                 {                     foreach (excel.range row in rows)                     {                         if (row.cells.entirerow.interior.colorindex == -4142)                         {                             row.interior.color = system.drawing.color.red;                         }                     }                     workbook.save();                     workbook.close();                 }                 catch (exception ex)                 {                     messagebox.show(ex.tostring());                 }

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