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    <p>The problem is here</p> <pre><code> string myString = _range.Cells.Value2.ToString(); </code></pre> <p>And here</p> <pre><code> // match any SSN e.g. 1236780909, 123-33-2445 if (Regex.IsMatch(myString, @"\b\d{3}\b\d{2}\b\d{4}")); { _range.Cells.Value2 = replaceSSN; } </code></pre> <p>I think you are misunderstanding what Value2 is, Its the array reprentation of the range you have defined above.</p> <pre><code>Excel.Range _range =(Excel.Range)_excelApp.get_Range("A1:K1",Type.Missing); </code></pre> <p>Value2 Property of the Range class,returns an array of values. what you need to do is perhaps declare a empty array and get the Value2 of the range, loop each item in the array and run the regex, if it finds a match replace the item in the array. Then you could set the array back to the Value2 of the Range, which will update the cells values.</p> <p>EDIT: Please find some sample code below</p> <pre><code> var excelApp = new Application(); excelApp.Workbooks.Open("c:\\Test.xls",Type.Missing,Type.Missing, Type.Missing,Type.Missing, Type.Missing,Type.Missing, Type.Missing,Type.Missing, Type.Missing,Type.Missing, Type.Missing,Type.Missing, Type.Missing,Type.Missing); var ws = excelApp.Worksheets; var worksheet =(Worksheet) ws.get_Item("Sheet1"); Range range = worksheet.UsedRange; // In the following cases Value2 returns different types // 1. the range variable points to a single cell // Value2 returns a object // 2. the range variable points to many cells // Value2 returns object[,] object[,] values = (object[,])range.Value2; for (int row = 1; row &lt;= values.GetUpperBound(0); row++) for (int col = 1; col &lt;= values.GetUpperBound(1); col++) { string value = Convert.ToString(values[row, col]); //Also used a different regex, found yours not to match on your given criteria if (Regex.IsMatch(value, @"^\d{3}-\d{2}-\d{4}$")) { range.Cells.set_Item(row,col,"0"); } } excelApp.Save("C:\\Out.xls"); excelApp.Quit(); Marshal.ReleaseComObject(worksheet); Marshal.ReleaseComObject(ws); Marshal.ReleaseComObject(excelApp); </code></pre>
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    1. POreplace cell values within excel using excel.interop
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    1. USalmog.ori
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    1. COWorks perfectly. Thank you so much Ori... you've saved my head from more headaches...lol... I also completely understand what you've done... a learning experience as well... thanks again!
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    2. COno problem anytime :)
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    3. COHey Ori, I've just encountered a bug. I get an Unable to cast object of type 'System.Double' to type 'System.Object[,]'. whenever only one cell is in the range. If there is more than one cell that is populated in the range, then it works fine... any ideas?
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