How we can provide data to ado.net?

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What are datareaders?

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What is dataset object? Explain the various objects in dataset.

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What is csdl entity framework?

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Explain the difference between an ado.net dataset and an ado recordset?

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Describe the command object and its method.

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What is sqlconnection and sqlcommand?

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Describe ado.net object model in detail.

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What is isolation?

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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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Which is faster datareader or dataadapter?

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can we change the data in dataset? if yes what is the process?

1 Answers   Artech,

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