read datetime value from database asp.net

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Now I have coding

string vcode = txtVcode.text;
ddlPurchaseCode.Items.Clear();
string qry = "select PurchaseCode from tblPurchasedInfo where VendorCode='" + vcode + "' and BillNo='" + ddlBillNo.SelectedValue + "' and PurchaseDate='" + ddlPurchaseDate.SelectedValue + "'";

SqlDataReader rds= cls.showDataFromTable(qry);
while (rds.Read())
{
ddlPurchaseCode.Items.Add(rds[0].ToString());
}//end of while
rds.Close();
cls.con.Close();

and Database design

SQL

CREATE TABLE [dbo].[tblPurchasedInfo](
    [PurchaseCode] [varchar](50) NOT NULL,
    [PurchaseDate] [smalldatetime] NOT NULL,
    [EntryDate] [smalldatetime] NOT NULL,
    [BillNo] [varchar](50) NOT NULL,
    [VendorCode] [varchar](50) NOT NULL,
    [Purchaseno] [bigint] IDENTITY(1,1) NOT NULL
) ON [PRIMARY]

The problem is : Data is not loading in ddlPurchaseCode(Dropdownlist)
Can u help what shoul I do.
If I make PurchaseDate as varchar(50) in database, problem will be solved but it will be problem in other pages and transaction. Can u help how to solve.

Posted 16-Mar-13 0:21am

Darpan Dahal

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Shubham Choudhary 16-Mar-13 7:03am

so whats the error!!! can you post it.

3 solutions

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Richard MacCutchan · Answer 1 · 2013-03-16T01:10:00

This is probably because you are taking values direct and just concatenating them into your command string. This will cause two possible problems:

Your date field will be a string, and thus may not match with what is in the data base.
You are leaving your code open to SQL injection, meaning that your data, or the entire system can be destroyed.

Change your code to use proper parameterised queries on your database, and validate your parameters before using them.

Shubham Choudhary · Answer 2 · 2013-03-16T01:17:00

Hi!!!

convert the dropdownlist selected value
like

C#

DateTime dt;
dt = Convert.ToDateTime(ddl.selectedvalue)";



 void ddlfunction()
    {
        confunction();//your connectionstring
        con.Open();
        MySqlCommand cmd = new MySqlCommand("select PurchaseCode from tblPurchasedInfo where VendorCode='" + vcode + "' and BillNo='" + ddlBillNo.SelectedValue + "' and PurchaseDate='" + dt + "'";)", con);
        MySqlDataReader dr = cmd.ExecuteReader();
        while (dr.Read())
        {

            ddl.Items.Add(dr["Column_Name"].ToString());

        }
        con.Close();

I write this code in notepad so make correction on it!!

sunil mali · Answer 3 · 2013-03-16T03:32:00

SELECT CONVERT(varchar(20),PurchaseDate,108) as Date

use following query in your code

string qry = "select PurchaseCode from tblPurchasedInfo where VendorCode='" + vcode + "' and BillNo='" + ddlBillNo.SelectedValue + "' and SELECT CONVERT(varchar(20),PurchaseDate,108) as Date='" + ddlPurchaseDate.SelectedValue + "'";

this will definately solve your problem.

read datetime value from database asp.net

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