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Create a reliable backup. Make sure you always have dependable copies of your data so you can restore your entire system or individual files.
Random rnd = new Random();
string str1 = "H" + rnd.Next().ToString().Substring(0, 5);
char ch = Guid.NewGuid().ToString().Where(x => char.IsNumber(Convert.ToChar(x))).Take(5).ToArray();
string str2 = "H" + (new string(ch));
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the 5 numbers can be random, but once it is created, it can't be duplicated.
CREATE UNIQUE INDEX IndexName ON TableName (ColName)
ALTER TABLE TableName
ADD CONSTRAINT PK_TableName_ColName PRIMARY KEY (Colname)
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