如何根据另一个文本框的值自动设置文本框的值

Question

I had textbox1 , textbox2 , and textbox3 I want to automatically set value of textbox2 and textbox3 according to value of textbox1 which has an auto complete method as below...

what should I do within the while clause to automatically set value of textbox2 and textbox3 after finishing auto complete at textbox1 ??

I am working on these error form two days everything is public within my code... I have one think i am wondering about is that new class should be defined within the namespace scope like namespace { Class class_name} but I am defining the class instead of another class like name spaces {class Class_name1 {classs Class_name2 } } but my problem is that when i put my class within the name spaces scope I am getting alot of error and it wont recognize a lot of key words ... so please would tha be the problem ?? and if yes please can you lead me to solve this ???

public class PopulateProduct { public string ProductDesc { get; set; } public decimal UnitPrice { get; set; } }

    Dictionary<string, PopulateProduct> dict = new Dictionary<string, PopulateProduct>();

    public void load()
    {
        string connstr = "user id=rawpic;password=admin";
        string cmdtxt = @"select PRODUCT_ID,DESCRIPTION,UNIT_PRICE 
                              from products";

        AutoCompleteStringCollection autocom = new AutoCompleteStringCollection();
        TB_PRODUCT_ID.AutoCompleteMode = AutoCompleteMode.Suggest;
        TB_PRODUCT_ID.AutoCompleteSource = AutoCompleteSource.CustomSource;
        TB_PRODUCT_ID.AutoCompleteCustomSource = autocom;

        using (OracleConnection conn = new OracleConnection(connstr))
        using (OracleCommand cmd = new OracleCommand(cmdtxt, conn))
        {
            try
            {
                conn.Open();
                OracleDataReader dr = cmd.ExecuteReader();

                while (dr.Read())
                {
                    dict.Add((string)dr["PRODUCT_ID"],
                        new PopulateProduct()
                        {
                            ProductDesc = (string)dr["DESCRIPTION"],
                            UnitPrice = (decimal)dr["UNIT_PRICE"]
                        });
                    autocom.Add(dr["PRODUCT_ID"].ToString());
                }

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message,"",MessageBoxButtons.OK,MessageBoxIcon.Error);
            }
        }
    }


    private void TB_PRODUCT_ID_TextChanged(object sender, EventArgs e)
    {
        if (dict.ContainsKey(TB_PRODUCT_ID.Text)) 
        {
            TB_PRODUCTS_DESC.Text = dict[TB_PRODUCT_ID.Text].ProductDesc;
            TB_UNIT_PRICE.Text = dict[TB_PRODUCT_ID.Text].UnitPrice.ToString();
        }
    }

Answer 1

"...everything is public within my code..."

Please check again. Properties of your Object model is not public yet (and Object is not a good name for your model ... how about Product ?) :

public class Product
{
    public string ProductDesc { get; set; }
    public decimal UnitPrice { get; set; }
}

Regarding the last part of the error message, that's because DataReader["column_name"] returns object. You need to explicitly cast the result to suitable type :

dict.Add((string)dr["PRODUCT_ID"], 
         new Product() 
         { 
            ProductDesc = (string)dr["DESCRIPTION"], 
            UnitPrice = (decimal)dr["UNIT_PRICE"]
         });