How to add an aggregate column?

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How can I retrieve two tables of data at a time by using data reader?

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What are two types of transaction supported by ado.net?

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What is the difference between Command and CommandBuilder object?

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What is the use of sqldatareader class?

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Explain how to copy the contents from one table to another table and how to delete the source table in ado.net?

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What is a dataview?

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Is entity framework better than ado.net?

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Why is it important to close an ado.net application?

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What is difference between entity framework and ado.net?

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Can I use One Data Set for More than one Data Adapter?

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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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