What is ado.net tutorial?

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What are the difference between readonly vs. Const?

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Which object of ado contains datarow datacolumn collection?

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What is basic use of data view?

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We all know that Dataset is purely disconnected architechure, but we also know that we can update the changes made to the dataset can be updated in the backend database. when there is no connection how does the update happedn?

6 Answers   Accenture, FastStream,

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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 is a sqldataadapter?

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What is the difference between executequery and executenonquery?

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Some important instruction regarding ADO.NET connection string ?

0 Answers   NA,

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What is DataReader Object?

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What is executescalar and executenonquery?

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What are the three Objects of ADO.

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