c# - ".TextToColumns" with ".NumberFormat" -

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i've got text file i'm trying save xlsx file. before saving , closing need perform texttocolumns , need column "h" remain in "text" format.

the below code converts column "h" "text" format when ".texttocolumns" executes column "h" changes "custom" format changing the data.

        microsoft.office.interop.excel.application oxl;         microsoft.office.interop.excel.workbook datab;         microsoft.office.interop.excel.worksheet datas;          string path = @"c:\users\fakename\desktop\extracted_formatted samplefile.csv";          oxl = new microsoft.office.interop.excel.application();         datab = oxl.workbooks.open(path, 0,             false, 5, missing.value, missing.value, false, missing.value, missing.value,             false, false, missing.value, false, false, false);         datab.application.displayalerts = false;         oxl.visible = true;         datas = (microsoft.office.interop.excel.worksheet)datab.activesheet;          range excelrange = datas.get_range("h1").entirecolumn;         excelrange.numberformat = "@";          datas.get_range("a1", ("a" + datas.usedrange.rows.count)).texttocolumns(             type.missing, microsoft.office.interop.excel.xltextparsingtype.xldelimited,             microsoft.office.interop.excel.xltextqualifier.xltextqualifiernone, false,             false, false, false, false, true, "|", type.missing, type.missing, type.missing, type.missing);          datas.name = "psh";         datas.saveas(@"c:\users\fakename\desktop\2\moresamplefiles", microsoft.office.interop.excel.xlfileformat.xlworkbookdefault);         datab.close(missing.value, missing.value, missing.value);         oxl.quit();


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