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    <p>Another, similar approach that works on any valid X12 file to replace a single data value with another on a matching segment:</p> <pre><code>public void ReplaceData(string filePath, string segmentName, int elementPosition, int componentPosition, string oldData, string newData) { string text = File.ReadAllText(filePath); Match match = Regex.Match(text, @"^ISA(?&lt;e&gt;.).{100}(?&lt;c&gt;.)(?&lt;s&gt;.)(\w+.*?\k&lt;s&gt;)*IEA\k&lt;e&gt;\d*\k&lt;e&gt;\d*\k&lt;s&gt;$"); if (!match.Success) throw new InvalidOperationException("Not an X12 file"); char elementSeparator = match.Groups["e"].Value[0]; char componentSeparator = match.Groups["c"].Value[0]; char segmentTerminator = match.Groups["s"].Value[0]; var segments = text .Split(segmentTerminator) .Select(s =&gt; s.Split(elementSeparator) .Select(e =&gt; e.Split(componentSeparator)).ToArray()) .ToArray(); foreach (var segment in segments.Where(s =&gt; s[0][0] == segmentName &amp;&amp; s.Count() &gt; elementPosition &amp;&amp; s[elementPosition].Count() &gt; componentPosition &amp;&amp; s[elementPosition][componentPosition] == oldData)) { segment[elementPosition][componentPosition] = newData; } File.WriteAllText(filePath, string.Join(segmentTerminator.ToString(), segments .Select(e =&gt; string.Join(elementSeparator.ToString(), e.Select(c =&gt; string.Join(componentSeparator.ToString(), c)) .ToArray())) .ToArray())); } </code></pre> <p>The regular expression used validates a proper X12 interchange envelope and assures that all segments within the file contain at least a one character name element. It also parses out the element and component separators as well as the segment terminator.</p>
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Guidance
A row detail

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.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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