How To Update Data datagridview c# after Update database sql

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cmd.CommandType = CommandType.Text;
               cmd.Connection = sqlcon;
               cmd = new SqlCommand("update  TBL_InvoicContent set pid='" + txtpid.Text + "',remainder='" + txtremainder.Text + "' where  id_invoice= " + txtidincon.Text + "  and fk_id_product = " + txtidItems.Text + " ", sqlcon);

               sqlcon.Open();
               cmd.ExecuteNonQuery();
               MessageBox.Show("Edited");
               sqlcon.Close();

Posted 11-Jan-15 13:16pm

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syed shanu 11-Jan-15 19:28pm

Do you mean after you update data you want to refresh the Datagridview and display with update data.If so then after update you have to rebind the Datagridview.

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Sergey Alexandrovich Kryukov · Answer 1 · 2015-01-11T13:31:00

I would suggest you use binding. There are many manuals; and the UI refresh problem (including DataGridView refresh) was discussed too many times; you will find a lot of material with code samples:
http://msdn.microsoft.com/en-us/library/2b4be09b.aspx[^] (original MSDN article),
http://tech.pro/tutorial/664/csharp-tutorial-binding-a-datagridview-to-a-database[^],
http://csharp.net-informations.com/datagridview/csharp-datagridview-database-operations.htm[^],
http://stackoverflow.com/questions/21284548/how-to-synchronize-database-and-datagridview[^],
http://stackoverflow.com/questions/10888561/refresh-datagridview-win-forms-after-updating-the-database-from-a-child-form[^].

But you have much worse problem with your query. Your approach is wrong from the very beginning. Your query is composed by concatenation with strings taken from UI. Not only repeated string concatenation is inefficient (because strings are immutable; do I have to explain why it makes repeated concatenation bad?), but there is way more important issue: it opens the doors to a well-known exploit called SQL injection.

This is how it works: http://xkcd.com/327[^].

What to do? Just read about this problem and the main remedy: parametrized statements: http://en.wikipedia.org/wiki/SQL_injection[^].

With ADO.NET, use this: http://msdn.microsoft.com/en-us/library/ff648339.aspx[^].

Please see my past answers for some more detail:
EROR IN UPATE in com.ExecuteNonQuery();[^],
hi name is not displaying in name?[^].

—SA