Explain the architecture of ado.net?

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Which object holds only data and does not interact with data source?

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What is the provider being used to access oracle database?

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What is ado and dao?

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How to identify the updated rows in a dataset?

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How to maintain the relation between two tables in ADO.NET?

0 Answers   Petranics Solutions,

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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 ole in excel?

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What is ambient transaction?

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Can a DataReader be used as a DataSource for a GridView. If it is so how will you handle paging.

3 Answers   Directi,

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What is the difference between a datareader and a dataset?

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Explain the difference between data reader and data adapter?

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