what is execute scalar?

11 Answers   Atharva Infotech, Dohatec New Media, Make eIT, Protech,

---

Explain the namespaces in which .net has the data functionality class.

0 Answers  

---

Which object of ado contains datarow datacolumn collection?

0 Answers  

---

What does connection string consists of ?

4 Answers   Digital GlobalSoft,

---

What is the difference between the clone() and copy() methods of the dataset class?

0 Answers  

---

What is difference between entity framework and ado.net?

0 Answers  

---

What are the disadvantages of using datalist?

0 Answers  

---

Define executenonquery?

0 Answers  

---

Explain the role of data provider in ado.net? What is the role of data provider in ado.net?

0 Answers  

---

What are the advantages of oledb compared with other classes?

0 Answers  

---

Why do we serialize data?

0 Answers  

---

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,

---