How can we add relation between tables in a dataset?

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What are the various methods provided by the DataSet object to generate XML?

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What is a data control clerk?

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Can you explain how to enable and disable connection pooling?

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What is the advantage of ado.net?

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If we are not returning any records from the database, which method is to be used?

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How to identify the updated rows in a dataset?

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How to read data with the sqldatareader ?

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What is microsoft ado.net?

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What is a string variable?

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What is the use of Dataview?

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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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