How do I remove duplicate rows in Linq?

How do I remove duplicate rows in Linq?

To remove duplicates from a C# list using Linq, do the following.

1. Define a new list. Ours has 7 elements, with “2” and “4” repeating.
2. Use Distinct().ToList() to make a new list with the distinct elements.
3. Print out to the console.

How can I delete duplicate rows in SQL with example?

SQL delete duplicate Rows using Common Table Expressions (CTE)

1. WITH CTE([firstname],
2. AS (SELECT [firstname],
3. ROW_NUMBER() OVER(PARTITION BY [firstname],
4. ORDER BY id) AS DuplicateCount.
5. FROM [SampleDB].[ dbo].[ employee])

How do you delete duplicate rows in SQL using Rowid?

Use the rowid pseudocolumn. DELETE FROM your_table WHERE rowid not in (SELECT MIN(rowid) FROM your_table GROUP BY column1, column2, column3); Where column1 , column2 , and column3 make up the identifying key for each record. You might list all your columns.

How to remove duplicate rows from a DataTable using LINQ?

I have seen the following solution used for removing duplicate rows in a DataTable using LINQ: Say if we have a DataTable with duplicate rows called dt, then the following statemend apparently does the job: But this is only removing duplicate rows that are identical.

How to remove or delete duplicate rows in data table?

I just want to compare the two columns in data table, if any duplicate records found then we should delete that rows and maintain original same in the data table.. How do i remove or delete using C# Linq (the unique column is MaterialNo and Name)

How to remove duplicates in a list in C #?

You have three option here for removing duplicate item in your List: Use a a custom equality comparer and then use Distinct(new DistinctItemComparer()) as @Christian Hayter mentioned. Use GroupBy, but please note in GroupBy you should Group by all of the columns because if you just group by Id it doesn’t remove duplicate items always.