Display a value in textbox from db

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How can we implement a highest value in textbox which is increment by 1 in page load

What I have tried:

C#

protected void Page_Load(object sender, EventArgs e)
{
if (!this.Page.User.Identity.IsAuthenticated)
            {
                FormsAuthentication.RedirectToLoginPage();
            }
            txt_id= ('SELECT MAX(unitid) + 1  from tblunitmaster');
}

Posted 18-Sep-17 0:10am

Member 13171100

Updated 18-Sep-17 17:36pm

Thanks7872

v5

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Vaidhya.P · Answer 1 · 2017-09-18T00:38:00

We cannot do like the above logic. If you write the code in the page load with out any conditions then when ever you post back it will be executed.

Step 1 : In post-back 1st verify if it is a login or a post back.
Step 2 : Then get the value from the Database and set that in a local variable/Session and increase the count in the database.
Step 3 : Separate this logic into a another class or a function to make sure the code is clean and readable.

txt_id= ('SELECT MAX(unitid) + 1 from tblunitmaster');

--> you have to use SQL server connection to connect to the database.

If this dint solve your purpose please reply and explain you req. clearly. Thanks in advance :)

Karthik_Mahalingam · Answer 2 · 2017-09-18T17:36:00

Solution 2

use ExecuteScalar [^] to read the data from db and display it on any UI control.
have a look on Page.IsPostBack Property [^] since the page_Load event will be fired when there is post back in the page which in turn, will increment the value in the textbox.

Posted 18-Sep-17 17:36pm

Karthik_Mahalingam