filter gridview based on a dropdownlist selectedValue

Question

1.00/5 (1 vote)

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Hello.
Im trying to do a exercise filter GridView based on selected value in DropDownList.
I have a list of names in dropdownlist and when i click in the name i want that information of persons appears in datagridview.
Im trying do this like this:

C#

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
       {
           OleDbConnection con = new OleDbConnection("Data Source=orcl;Persist Security Info=True;User ID=eq;Password=*******;Unicode=True");
           OleDbDataAdapter dataAdapter = new OleDbDataAdapter(String.Format("select * from teacher where idteacher={0} ", idteacher), con);

           DataTable table = new DataTable();
           dataAdapter.Fill(table);
           GridView1.DataSource = table;
          }

but its not working, and "Datatable" object is not recognized buy c#.
Anyone can help me seeing what im doing wrong?
Thanks!

Posted 11-Jun-13 10:46am

mibetty

Updated 11-Jun-13 17:53pm

Thanks7872

v2

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Comments

Sergey Alexandrovich Kryukov 11-Jun-13 17:22pm

What do you mean? There is no "database object" in your code.
—SA

PrissySC 11-Jun-13 17:23pm

Ouch ... you are filling the data each time they click the drop down?

Create a bindingsource and add the data one time.

Fiter and assign to the datagridview based on the dropdown selection. Do this at the very least. :)

There are, however, a zillion ways to deal with the datagridview and filtering. :) Hit the MSDN and read up on filtering the DGV!

2 solutions

Solution 1

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
string comand = "select * from teacher";
OracleConnection con = new System.Data.OracleClient.OracleConnection();
con.ConnectionString = @"Data Source=orcl;Persist Security Info=True;User ID=eq;Password=***;Unicode=True";
OracleDataAdapter dataAdapter = new OracleDataAdapter(String.Format("select * from teacher where idteacher={0} ", comand), con);

DataTable table = new DataTable();
dataAdapter.Fill(table);
GridView1.DataSource = table;
GridView1.DataBind();
}

Now i have datatable object!
But i got this error in this line : dataAdapter.Fill(table);

Error : ORA-00936: missing expression´

Do you know why can be this error?

Posted 11-Jun-13 12:00pm

mibetty

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Aydin Homay · Accepted Answer · 2013-06-11T18:07:00

Hi
Please be sure about using System.Data namespace and the after that keep in your mind you should call DataBind() method after data source binding in asp.net so I think you forget it:

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
       {
           OleDbConnection con = new OleDbConnection("Data Source=orcl;Persist Security Info=True;User ID=eq;Password=*******;Unicode=True");
           OleDbDataAdapter dataAdapter = new OleDbDataAdapter(String.Format("select * from teacher where idteacher={0} ", idteacher), con);

           DataTable table = new DataTable();
           dataAdapter.Fill(table);
           GridView1.DataSource = table;
           GridView1.DataBind();
          }

At the finally I prefer to you review follow of link:
Five different overloads of the DataAdapter.Fill() method[^]

Best Regards.