How To Delete Record From SQL Server Database In Web Application

Jun 19, 2012

I have a id in label1 ...

on button click i want to delete the data of id from database ...

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I have a form where users can subscribe and unsubcribe to my email list. so far, i have the subscribe button working fine "add member" function. Now i need help with my "delete member " function (unsubscribe button). it will allows the user to delete their record from the database. When I run the code and click the "unsubscribe" button, i can't get the logic correct so that it will delete the user's record if it exisit. here's the code i'm using for the subscribe and unsubscribe buttons

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
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}
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[Code]....

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''Add
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I have  one text box in my page and 1 button

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I have a question about linq delete.

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I'm having a gridview in my aspx page with checkbox, User can select one or more than one record(s) at a time and clicks on delete button, Then i'm constructing an object of my DTO and adding all the checked row's Primary Key (DataKeyNames - GUID's in case) to a serializable class and generating an XML and sending it as parameter to the Stored Procedure.

My Doubt is, can i bulk delete all the rows from database table those are present in my XML document??

If it works, I can do bulk update with XML only, i already did bulk insertion by generating an XML..

My Another Question is, Will it affect the performance? Each time when i construct an DTO object and adding it to the Generic List??

WHich one is better, I mean ObjectDataSource or SQLDataSource or my XML method?

My XML will be like this

<root>
<Customer>
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<CustomerID>GUID2</CustomerID>
<CustomerID>GUID3</CustomerID>.....

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Jun 24, 2010

I am counting from a table for that i have written code as below

protected void get_Id_Afterpoint()
{
int counter = 0;
string strSql = "select count(*) as ID from tblEnergy where ID=?";
OdbcCommand com = new OdbcCommand(strSql, con);
com.Parameters.AddWithValue("ID", DropDownList1.SelectedValue);
OdbcDataAdapter oda = new OdbcDataAdapter(com);
DataTable dt = new DataTable();
oda.Fill(dt);
if (dt.Rows.Count == 0)
{
lblID2.Text = "1";
}
else
{
counter = dt.Rows.Count;
counter = counter + 1;
lblID2.Text = Convert.ToString(counter);
}
}

there is no record related to DropDownList1.SelectedValue. but as i am counting if(dt.rows.count) and i put break point on the bolded part it shows 1 record. how it can be possible?

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Is it possible to use LINQ to delete a row in a table within an SQL database? I am using an ADO connected command statement to delete a row where a string column equals a name. But, I would prefer to use an easier way with LINQ, if possible.

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[Code]....

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Must declare the scalar variable "@reg_id".

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I have asp.net app where I am using gridview for data showing, editing and deleting. Now I want to delete or edit record from table and I need to pass 3 cols in DataBinder.Eval(Container.DataItem,"colName"). how i can do this?

EDITED

Basically when i need to update or delete record from asp.net app, I have to pass values of 3 columns (which are composite keys) to my UDF. Now How I can pass 3 different values to DataBinder.Eval() and reading them in GridView Rowcommand event.

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