What does executereader return?

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,

---

Explain different methods and Properties of DataReader which you have used in your project?

2 Answers  

---

How xml files and be read and write using dataset ?

1 Answers  

---

how to display empty table to datagrid

3 Answers   LG Soft,

---

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

0 Answers  

---

What is a string variable?

0 Answers  

---

Diff B/W DataSet vs DataTable

6 Answers   Star Wire,

---

What is data adapter in ado.net with example?

0 Answers  

---

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

6 Answers  

---

Explain the differences between oledb sql server, oledbdotnet provider?

0 Answers  

---

Why do we serialize data?

0 Answers  

---