Explain the two fundamental objects in ado.net?

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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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What are the main differences between classic ado and ado.net?

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What is the default view of Data Grid?

5 Answers   TCS,

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What is difference between connected and disconnected architecture in ado.net?

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What are the benefits of using ado.net?

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What is defaultview in datatable?

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What providers do you use to connect to oracle database ?

4 Answers   Digital GlobalSoft,

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Explain the basic use of "dataview" and explain its methods.

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What is microsoft ole db provider for sql server?

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Explain the dataadapter class in ado.net?

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What are the rules to implement connection pooling?

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