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<blockquote data-quote="horned_reaper" data-source="post: 1270050" data-attributes="member: 109929">What about comparing the hash value of a new picture with the has values of the other (maximum 9) stored pictures of an artist before storing it?[CODE]using System;using System.Security.Cryptography;using System.Text;namespace ComputeAHash_csharp{/// &lt;summary&gt;/// Summary description for Class1./// &lt;/summary&gt;class Class1{static void Main(string[] args){string sSourceData;byte[] tmpSource;byte[] tmpHash;sSourceData = &quot;MySourceData&quot;;//Create a byte array from source datatmpSource = ASCIIEncoding.ASCII.GetBytes(sSourceData);//Compute hash based on source datatmpHash = new MD5CryptoServiceProvider().ComputeHash(tmpSource);Console.WriteLine(ByteArrayToString(tmpHash));sSourceData = &quot;NotMySourceData&quot;;tmpSource = ASCIIEncoding.ASCII.GetBytes(sSourceData);byte[] tmpNewHash;tmpNewHash = new MD5CryptoServiceProvider().ComputeHash(tmpSource);bool bEqual = false;if (tmpNewHash.Length == tmpHash.Length){int i=0;while ((i &lt; tmpNewHash.Length) &amp;&amp; (tmpNewHash[i] == tmpHash[i])){i += 1;}if (i == tmpNewHash.Length){bEqual = true;}}&nbsp; &nbsp; &nbsp; &nbsp; if (bEqual)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Console.WriteLine(&quot;The two hash values are the same&quot;);&nbsp; &nbsp; &nbsp; &nbsp; else&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Console.WriteLine(&quot;The two hash values are not the same&quot;);&nbsp; &nbsp; &nbsp; &nbsp; Console.ReadLine();}static string ByteArrayToString(byte[] arrInput){int i;StringBuilder sOutput = new StringBuilder(arrInput.Length);for (i=0;i &lt; arrInput.Length -1; i++){sOutput.Append(arrInput[i].ToString(&quot;X2&quot;));}return sOutput.ToString();}}}[/CODE][URL unfurl=&quot;true&quot;]https://support.microsoft.com/en-za/help/307020/how-to-compute-and-compare-hash-values-by-using-visual-c[/URL]</blockquote>

[QUOTE="horned_reaper, post: 1270050, member: 109929"] What about comparing the hash value of a new picture with the has values of the other (maximum 9) stored pictures of an artist before storing it? [CODE]using System; using System.Security.Cryptography; using System.Text; namespace ComputeAHash_csharp { /// <summary> /// Summary description for Class1. /// </summary> class Class1 { static void Main(string[] args) { string sSourceData; byte[] tmpSource; byte[] tmpHash; sSourceData = "MySourceData"; //Create a byte array from source data tmpSource = ASCIIEncoding.ASCII.GetBytes(sSourceData); //Compute hash based on source data tmpHash = new MD5CryptoServiceProvider().ComputeHash(tmpSource); Console.WriteLine(ByteArrayToString(tmpHash)); sSourceData = "NotMySourceData"; tmpSource = ASCIIEncoding.ASCII.GetBytes(sSourceData); byte[] tmpNewHash; tmpNewHash = new MD5CryptoServiceProvider().ComputeHash(tmpSource); bool bEqual = false; if (tmpNewHash.Length == tmpHash.Length) { int i=0; while ((i < tmpNewHash.Length) && (tmpNewHash[i] == tmpHash[i])) { i += 1; } if (i == tmpNewHash.Length) { bEqual = true; } } if (bEqual) Console.WriteLine("The two hash values are the same"); else Console.WriteLine("The two hash values are not the same"); Console.ReadLine(); } static string ByteArrayToString(byte[] arrInput) { int i; StringBuilder sOutput = new StringBuilder(arrInput.Length); for (i=0;i < arrInput.Length -1; i++) { sOutput.Append(arrInput[i].ToString("X2")); } return sOutput.ToString(); } } }[/CODE] [URL unfurl="true"]https://support.microsoft.com/en-za/help/307020/how-to-compute-and-compare-hash-values-by-using-visual-c[/URL] [/QUOTE]

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