Answer / hhh

DataSet carry considerable overhead because of relations,
multiple tables,
While DataReader only readony and fawardonly stream of
data, it fatch only one row at a time. thats y its faster

Answer / abhishek

datareader is forwardonly thus is fast and is mostly used
while retrieving the data from the database.

How To Update A Column In A DataGrid Using C#.NET? I am getting InvalidCastException as (Specified cast is not valid) while updating 2nd column in a datagrid? Id,firstname,lastname are the three columns of my datagrid respectively. I wanted to edit the second column(lastname) and update it. I did the following code in DataGrid's updatecommand(),but failed to update ! Int varid=(int)DataGrid1.DataKeys[e.Item.ItemIndex]; TextBox lnm=(TextBox)e.Item.Cells[2].Controls[0]; string str=lnm.Text ; SqlCommand cmd=new SqlCommand("update customer set lastname='" + str + "' where id=" + varid + "",con); cmd.ExecuteNonQuery(); DataGrid1.EditItemIndex=- 1; DataGrid1.DataBind();

2 Answers   Mind Tree, TCS,

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how to keep track of index in listbox items.

2 Answers  

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What is connection string?

0 Answers  

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Is entity framework better than ado.net?

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If a table contains 20000 records. In a page at each time 100 records to be displayed.

0 Answers  

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Which parameter of ConnectionString is used to specify the name of the database?

0 Answers  

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How do you implement locking concept for dataset?

0 Answers  

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Which database is the ado.net?

0 Answers  

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What is difference between datareader and dataadapter?

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What is ole db and odbc?

0 Answers  

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If we want to connect to many databases in dataaccess layer such as MSAccess,Sql server,oracle means not to a particular database depends on condition we have to connect to appropriate database in this scenario if we without changing code Ho wdo you handle this situation?

4 Answers   Honeywell,

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What is an orm, and why would you use one instead of plain old ado.net?

0 Answers  

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