How to create custom Guid for auto Generation ?

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i need Student Admission number in auto generation i used Guid but it's very large random numbers

i need only first 4 values letters next 8 numbers
pls help ?

Guid id = Guid.NewGuid();

Posted 19-Oct-14 23:36pm

Prasanth Radhakrishanan

Updated 19-Oct-14 23:37pm

v2

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Comments

Abhijit Ghosh (Subho) 20-Oct-14 5:41am

Why not create your own using Random class? If your problem is that the generated guid is large, just extract a substring from it. If you need a autogenerated number with custom specifications, you have to build your own.

CHill60 20-Oct-14 6:29am

Why not just use an Identity column on your database? Uniqueness comes for free. Not sure why everyone is focused on random numbers

Prasanth Radhakrishanan 20-Oct-14 6:34am

I'm used identity column but this for another Admission Id auto generation i need first format is "oxfod1001"

CHill60 21-Oct-14 8:22am

See my solution to your other post.

4 solutions

Solution 1

C#

static class StringExt {

public static IEnumerable<String> SplitInParts(this String s, Int32 partLength) {

    for (var i = 0; i < s.Length; i += partLength)
      yield return s.Substring(i, Math.Min(partLength, s.Length - i));
  }
}
var parts = System.Guid.NewGuid().ToString().Replace("-","").SplitInParts(4);

But remember for retaining the uniqueness you need to have the 16 digits. You can also use guid.ToString("N") for getting number without '-', please try and use the whole GUID it is made for a purpose. :)
Please try this and post back your comments if this works out.
Thanks.

Posted 19-Oct-14 23:45pm

Suraj Sahoo | Coding Passion

Updated 20-Oct-14 0:03am

v3

Solution 2

If you really need a GUID, that is a Global Unique Identifier [^], then you have to retain all its length.
On the other hand, if your requirements aren't so strict (e.g. you can drop the 'global' requirement) then you may generate a shorter random id.

Posted 19-Oct-14 23:47pm

CPallini

Solution 3

This would be helpful : http://www.sqlteam.com/article/custom-auto-generated-sequences-with-sql-server[^]

In this case, you will be generating numbers in SQL, not in code.

Posted 19-Oct-14 23:51pm

Thanks7872

Updated 19-Oct-14 23:52pm

v2

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*Abhijit Ghosh (Subho)* · Accepted Answer · 2014-10-20T00:10:00

Solution 4

You can do something like this.

var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
var nums = "0123456789";
var stringChars = new char[4];
var stringNums = new char[8];
var random = new Random();

for (int i = 0; i < stringChars.Length; i++)
    stringChars[i] = chars[random.Next(chars.Length)];
for (int i = 0; i < stringNums.Length; i++)
    stringNums[i] = nums[random.Next(nums.Length)];
var finalString = new char[stringChars.Length + stringNums.Length];
stringChars.CopyTo(finalString, 0);
stringNums.CopyTo(finalString, stringChars.Length);

The code block presented above will give you a randomized string with 4 alphabets followed by 8 numbers. finalString contains the generated string. Hope this helps.

-Subho

Posted 20-Oct-14 0:10am

Abhijit Ghosh (Subho)

Comments

Prasanth Radhakrishanan 20-Oct-14 6:29am

finalString return null not working

Abhijit Ghosh (Subho) 20-Oct-14 6:33am

Must be something at your end. I just tested this. Works fine.

Prasanth Radhakrishanan 20-Oct-14 6:36am

var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
..
..
..
var finalString = new char[stringChars.Length + stringNums.Length];
..
..

TextBox1.Text = finalString.ToString();
i tested

Abhijit Ghosh (Subho) 20-Oct-14 6:44am

If you didn't notice, FinalString is a char array.
Remove: TextBox1.Text = finalString.ToString();
Add: TextBox1.Text = new string(finalString);

Prasanth Radhakrishanan 20-Oct-14 6:51am

its working

Abhijit Ghosh (Subho) 20-Oct-14 12:41pm

Since you are converting it to a string after all, just convert both stringChars and stringNums to string and concatenate them. It will make the code smaller.

Prasanth Radhakrishanan 20-Oct-14 6:54am

hello this solution can increment type in each Registration pls...

Abhijit Ghosh (Subho) 20-Oct-14 12:41pm

I didn't get your point.