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CRUD using Entity Framework in .NET Framework 5.0 - (Update)

Article ID: 2796236 - View products that this article applies to.

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This article is provided by MVP Ming Man

(http://mvp.microsoft.com/en-US/findanmvp/Pages/profile.aspx?MVPID=f4165dfe-8265-43d0-854c-2dbe82ac1fd2)

. Microsoft is so thankful that MVPs who proactively share their professional experience with other users. The article would be posted on MVP's website

(http://mvp.microsoft.com/en-US/findanmvp/Pages/profile.aspx?MVPID=f4165dfe-8265-43d0-854c-2dbe82ac1fd2)

or blog

(http://chanmingman.wordpress.com/)

later.

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Summary

This article covers ways to update through Entity Framework. We start with updating a single record.

Update single records

The code below pass in a product id as the argument then update the product name based on the product id.

public static void Update(int Id)

{

northwindEntities ctx = new northwindEntities();

var result = from r in ctx.Products where r.ProductID == Id select r;

// Get the first record from the result

Product product = result.First();

// Update the product name

product.ProductName = "Drinks";

ctx.SaveChanges();

}

Bulk record update

The code below does a bulk update to the category id to all the products.

public static void BulkUpdate()

{

northwindEntities ctx = new northwindEntities();

var result = from r in ctx.Products select r;

foreach (Product p in result)

{

p.CategoryID = 1;

}

ctx.SaveChanges();

}

Bulk record update with SQL statement

The follow code does bulk update with SQL statement. The disadvantage of this is that the compiler is not able to check the syntax of the SQL statement.

public static void BulkUpdateSQL()

{

northwindEntities ctx = new northwindEntities();

ctx.Database.ExecuteSqlCommand("UPDATE Products SET CategoryID = 3");

}

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References

For more information, see CRUD using Entity Framework in .NET Framework 5.0 - (Create)

(http://support.microsoft.com/kb/2780458/en-us?wa=wsignin1.0)

and CRUD using Entity Framework in .NET Framework 5.0 - (Read)

(http://support.microsoft.com/kb/2791121/en-us?wa=wsignin1.0)

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