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 does executequery return?

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What are all the different authentication techniques used to connect to MS SQL Server?

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What is difference between datatable and dataset?

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How do you update database through dataset?

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About ADO and its objects ?

1 Answers   DELL,

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What are advantages and disadvantages of Microsoft-provided data provider classes in ADO.NET?

2 Answers  

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What is a datagridview?

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i have two textboxes one for user name and another for password . i have a table name compare(which contains name,passwod etc.,)my doubt is how compare username textbox with name column and how compare password textbox with passwod column. i want the code

9 Answers   Wipro,

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What is the default provider in ado.net?

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Which object is used to add relationship between two Datatables?

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