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    <p>I found solution to my own answer with some other workarounds.</p> <p>The calling function:</p> <pre><code> MyFunction() { //stuff I do before strValue = lstGetDecrName(strValue.ToList());//decrease value here if (strValue.Contains('-')) { strValue = "-"; } //stuff I do after } </code></pre> <p>In all there are 4 functions. 2 Main functions and 2 helper functions.</p> <pre><code> List&lt;char&gt; lstGetDecrName(List&lt;char&gt; lstVal)//entry point, returns decreased value { if (lstVal.Contains('-')) { return "-".ToList(); } List&lt;char&gt; lstTmp = lstVal; subCheckEmpty(ref lstTmp); switch (lstTmp.Count) { case 0: lstTmp.Add('-'); return lstTmp; case 1: if (lstTmp[0] == '-') { return lstTmp; } break; case 2: if (lstTmp[1] == '0') { if (lstTmp[0] == '1') { lstTmp.Clear(); lstTmp.Add('9'); return lstTmp; } if (lstTmp[0] == 'A') { lstTmp.Clear(); lstTmp.Add('-'); return lstTmp; } } if (lstTmp[1] == 'A') { if (lstTmp[0] == 'A') { lstTmp.Clear(); lstTmp.Add('Z'); return lstTmp; } } break; } List&lt;char&gt; lstValue = new List&lt;char&gt;(); switch (lstTmp.Last()) { case 'A': lstValue = lstGetDecrTemp('Z', lstTmp, lstVal); break; case 'a': lstValue = lstGetDecrTemp('z', lstTmp, lstVal); break; case '0': lstValue = lstGetDecrTemp('9', lstTmp, lstVal); break; default: char tmp = (char)(lstTmp.Last() - 1); lstTmp.RemoveAt(lstTmp.Count - 1); lstTmp.Add(tmp); subCheckEmpty(ref lstTmp); lstValue = lstTmp; break; } lstGetDecrSkipValue(lstValue); return lstValue; } List&lt;char&gt; lstGetDecrSkipValue(List&lt;char&gt; lstValue) { bool blnSkip = false; foreach (char tmpChar in lstValue) { if (lstChars.Contains(tmpChar)) { blnSkip = true; break; } } if (blnSkip) { lstValue = lstGetDecrName(lstValue); } return lstValue; } void subCheckEmpty(ref List&lt;char&gt; lstTmp) { bool blnFirst = true; int i = -1; foreach (char tmpChar in lstTmp) { if (char.IsDigit(tmpChar) &amp;&amp; blnFirst) { i = tmpChar == '0' ? lstTmp.IndexOf(tmpChar) : -1; if (tmpChar == '0') { i = lstTmp.IndexOf(tmpChar); } blnFirst = false; } } if (!blnFirst &amp;&amp; i != -1) { lstTmp.RemoveAt(i); subCheckEmpty(ref lstTmp); } } List&lt;char&gt; lstGetDecrTemp(char chrTemp, List&lt;char&gt; lstTmp, List&lt;char&gt; lstVal)//shifting places eg unit to ten,etc. { if (lstTmp.Count == 1) { lstTmp.Clear(); lstTmp.Add('-'); return lstTmp; } lstTmp.RemoveAt(lstTmp.Count - 1); lstVal = lstGetDecrName(lstTmp); lstVal.Insert(lstVal.Count, chrTemp); subCheckEmpty(ref lstVal); return lstVal; } </code></pre>
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