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,

---

What is the meaning of executenonquery?

0 Answers  

---

can we change the data in dataset? if yes what is the process?

1 Answers   Artech,

---

How do we invoke queries from the application ?

2 Answers   ICICI, Microsoft,

---

What is the use of Dataview?

0 Answers  

---

Explain the architecture of ado.net?

0 Answers  

---

What is sqldatareader in ado.net?

0 Answers  

---

What are the major challenges in accessing data from a database?

0 Answers  

---

Explain what a diffgram is and its usage ?

2 Answers  

---

What is the difference in record set and dataset?

0 Answers  

---

what is the syntax code for oldb to connect oracle

3 Answers   IBM,

---

Can you explain how to enable and disable connection pooling?

0 Answers  

---