What is difference between ado.net and asp net?

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What is data relation?

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What is executescalar and executenonquery?

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How to find the given query is optimised one or not?

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What is ado and dao?

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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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How to generate XML from a dataset and vice versa?

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What is the difference between Optimistic and Pessimistic locking?

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What is ado.net code?

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What are the benefits of using ado.net?

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What are the methods of XML dataset object?

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What is the usage of the dataset object in ado.net?

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