How to Get ID from Table to another table through dropdown

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C#

using (SqlCommand cmd = new SqlCommand("SELECT Id, Location FROM Location"))
       {
           cmd.CommandType = CommandType.Text;
           cmd.Connection = con;
           con.Open();
           location.DataSource = cmd.ExecuteReader();
           location.DataTextField = "Location";
           location.DataValueField = "Id";
           location.DataBind();
           con.Close();
       }
       location.Items.Insert(0, new ListItem("--Select Location--", "0"));

Location Table
Id Location
1 US
2 UK
3 UAE

User Table
Id Name Location
1 XYZ 0
2 UXA 0

C#

cmd1.Parameters.AddWithValue("@Location", location.Text);

The ASP code is here

ASP.NET

<asp:DropDownList ID = "location" runat="server" CssClass="formcss" Width="100%"> </asp:DropDownList>

My Problem is that how do i store id of selected location into user table . By the given code i get 0 in all the row of inserted data . Please Help

Posted 6-Aug-15 8:47am

Mudreka Shabbir Hussain

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Comments

j snooze 6-Aug-15 17:08pm

Not much to go on here with what little code you provided and where you are calling it, but I'm going to take a wild shot in the dark and guess that you are rebinding your drop down to the data reader in the page load function of the webforms code behind. So every postback rebinds the drop down list and its always the first one. Try putting this around your databinding
if(!Page.IsPostback){
using (SqlCommand cmd = new SqlCommand("SELECT Id, Location FROM Location"))
{
cmd.CommandType = CommandType.Text;
cmd.Connection = con;
con.Open();
location.DataSource = cmd.ExecuteReader();
location.DataTextField = "Location";
location.DataValueField = "Id";
location.DataBind();
con.Close();
}
location.Items.Insert(0, new ListItem("--Select Location--", "0"));
}

2 solutions

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Arasappan · Answer 1 · 2015-08-06T17:22:00

U have to bind the value of dropdownlist on postback.

C#

If(!IsPostBack)
{
LocationBind();
}
Public void Location()
{
cmd.CommandType = CommandType.Text;
            cmd.Connection = con;
            con.Open();
            location.DataSource = cmd.ExecuteReader();
            location.DataTextField = "Location";
            location.DataValueField = "Id";
            location.DataBind();
            con.Close();
}

and also pass the value

C#

cmd1.Parameters.AddWithValue("@Location", location.SelectedValue);

Er. Ajay Chauhan · Answer 2 · 2015-08-06T17:56:00

Solution 2

use this-

C#

cmd1.Parameters.AddWithValue("@Location", location.SelectedValue);

Posted 6-Aug-15 17:56pm

Er. Ajay Chauhan

Comments

Mudreka Shabbir Hussain 7-Aug-15 3:02am

I Tried this but didnt worked . I still get 0 in location Column

Er. Ajay Chauhan 7-Aug-15 4:41am

did you try below to bind drop-down list within PageLoad method;
If(!IsPostBack)
{
LocationBind();
}
which is in 1st solution provided by Kiing_Makerr....??
If you do not use !IsPostBack condition in Page Load than before every server side event, drop-down selected value will be initialize with 0...