Which object is used to add relationship between two Datatables?

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What is bubbled event?

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What are all the classes that are available in System.Data Namespace?

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Define executenonquery?

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What provider ado.net use by default? Explain the role of data provider in ado.net?

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What are the data providers used in ado.net

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What do you know about ado.net's methods?

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What does executereader return?

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can we have multiple datatables in a datareader ?

18 Answers   Fulcrum Logic, Infosys, Kale Consultants, Ness Technologies,

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Which property is used to check whether a DataReader is closed or opened?

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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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Does entity framework use ado.net?

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