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    <p>Field information argument of <code>OpenText()</code> for CSV should be a two-dimensional array of <code>System.Object</code> elements, i.e. <code>obj[,]</code>, like <code>fieldInfo</code>value in the snippet below (<a href="http://msdn.microsoft.com/en-us/library/office/microsoft.office.interop.excel.workbooks.opentext" rel="nofollow">Excel interop details are available here</a>):</p> <pre><code>open Microsoft.Office.Interop.Excel [&lt;EntryPoint&gt;] let main argv = let fieldInfo: obj[,] = Array2D.zeroCreate 2 2 fieldInfo.[0,0] &lt;- box 1; fieldInfo.[0,1] &lt;- box XlColumnDataType.xlTextFormat; fieldInfo.[1,0] &lt;- box 2; fieldInfo.[1,1] &lt;- box XlColumnDataType.xlGeneralFormat; let app = new ApplicationClass(Visible=true) app.Workbooks.OpenText(@"C:\test.txt", StartRow=1, DataType=XlTextParsingType.xlDelimited, TextQualifier=XlTextQualifier.xlTextQualifierNone, Comma=true, FieldInfo=fieldInfo) 0 </code></pre> <p>Now, if you put into <code>c:\test.txt</code> file something like <code>abc,123</code> it will be parsed into the workbook without problems.</p> <p><em>EDIT:</em> <code>FieldInfo</code> can be initialized in more succinct way; instead of 5 code lines above the following array expression will do the same:</p> <pre><code>let fieldInfo: obj[] = [|[|1; int XlColumnDataType.xlTextFormat|]; [|2; int XlColumnDataType.xlGeneralFormat|]|] </code></pre> <p>Original run-time exception you've encountered has nothing to do with type of array elements as <code>XlColumnDataType</code> is just an enumeration, so for Excel they are integers. What Excel does not like is that you feed it a F# jugged array of type <code>int[][]</code>. If you just force <strong><code>fieldInfo</code></strong> type in your original snippet from F#-inferred <strong><code>int[][]</code></strong> to explicit <strong><code>obj[]</code></strong> this small change will make it work.</p>
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    1. USGene Belitski
    1. USGene Belitski
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    1. COThat did it! Thank you so much. Not only did I have to box the values, but I also had to use a mutable array instead of an array expression. I don't understand why I had to do that; but at least my code works now. Thank you so much!
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      1. USJeff Maner
    2. CO@JeffManer: You are very welcome (c: In fact, as this is VB-like interop the same can be achieved with array expression of integers and compiler will do boxing for you. But you should cast `XlColumnDataType` to `int` as F# array should have members of the same type. I've edited my code to a more succinct.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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