What are different layers of ADO.Net?


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More ADO.NET Interview Questions

What are the namespaces used in ADO.Net to connect to a database?

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How to generate a single aggregate?

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How can we load multiple tables in to dataset?

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What is ado.net objects?

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What is sql connection in ado.net?

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What is ado in agriculture?

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

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What are the key events of sqlconnection class?

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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();

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What is dao and ado?

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How to bind the controls(best practice) comboboxes to the data in the dataset?

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How to identify the updated rows in a dataset?

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