OleDB Parameters

Question

I have this access db that I have a ddl for the state name and a ddl for the year. I have a gridview that I\'d like to pass the value of the state drop down list into where cla

Answer 1

1.you need to open your connection

2.you can add the parameter as follows

public DataSet GetData()
{
    DataSet ds;
    using (OleDbConnection conn = new OleDbConnection(connString))
    {
        string query= "select * from tblTest where location = ?";            
        using (OleDbCommand myCommand = new OleDbCommand(query, conn))
        {

            myCommand.Parameters.AddWithValue("@ddlStates", <your value>);
            conn.Open();

            using (OleDbDataAdapter da = new OleDbDataAdapter(myCommand, conn))
            {
                ds = new DataSet();
                da.Fill(ds, "Grades");
                return ds;
            }
        }

    }
}

Answer 2

myCommand.Parameters.AddWithKey("location", this.ddlStates.SelectedValue);

That assumes that the data type of the location column is textual. If it's numeric or something else then convert the SelectedValue to the appropriate data type first.