Interested to Buy Any Domain ? << Click Here >> for more details...
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
- 16171 Views
- Mind Tree, TCS, I also Faced
- E-Mail Answers
Answer Posted / aravazhi
Try this query you can avoid InvalidCastException...
string strQry = "update customer set lastname=@LastName
where id=@VarId";
SqlCommand cmd=new SqlCommand(strQry,con);
int varid = (int)DataGrid1.DataKeys[(int)e.Item.ItemIndex];
string LName = ((TextBox)e.Item.FondControl
("txtLName")).Text;//txtLname is ID of control
cmd.Paramters.Add(new SqlParameter("@LastName",LName));
cmd.Paramters.Add(new SqlParameter("@VarId",varid));
cmd.ExecuteNonQuery();
DataGrid1.EditItemIndex=- 1;
DataGrid1.DataBind();
| Is This Answer Correct ? | 15 Yes | 4 No |
Post New Answer View All Answers
What is typed dataset ?
Can we do database operations without using any of the ado.net objects?
How to Read, Add, Update and Delete record in Entity Framework ?
What are the several execute methods of ado.net?
How would you connect to a database by using .NET?
How to connect and retrieve data from database using dataset
What is concurrency? How will you avoid concurrency when dealing with dataset? (One user deleted one row after that another user through his dataset was trying to update same row. What will happen? How will you avoid the problem?)
What do you mean by ‘batch updates’?
Explain the DataAdapter.Update() and DataSetAcceptChanges() methods.
How to load multiple tables into a dataset?
oledbdataadpter with ms access in c#.net giving exception System.Data.OleDb.OleDbException while writing adapter.update(dataset,"tabname"); how to update the database from dataset?
What we do with the object of ado.net dataset after using it?
What are all features of ADO.Net?
How to find the given query is optimised one or not?
What is the use of Dataview?
