how to use if condition in dropdown selected index change event

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I am using two dropdownlist in my form in. i give If condition in dropdownlist1 for changing the dropdownlist2 values but it is not working ...this is my code

C#

if (DropDownList1.Text == "A")
{
    DropDownList2.Items.Add("1");
    DropDownList2.Items.Add("2");
}
if (DropDownList1.Text == "B")
{
    DropDownList2.Items.Add("3");
    DropDownList2.Items.Add("4");
}

Any one tell how to write the code for this one

Posted 27-Oct-11 0:14am

sarath ss

Updated 25-Dec-19 23:01pm

P.Salini

v4

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Comments

CodingLover 27-Oct-11 6:21am

When you are adding items to the other list, is there any other existing items?

5 solutions

Solution 5

C#

<pre lang="c#"><pre lang="c#">

For Example This is your Dropdown

 <asp:DropDownList ID="ddl_loginType" runat="server" align="center" AutoPostBack="true">
                <asp:ListItem Value="1" Text="">Student</asp:ListItem>
                <asp:ListItem Value="2" Text="">Teacher</asp:ListItem>
                </asp:DropDownList>

and this is code behind


<pre>if (ddl_loginType.SelectedValue == "1")
            {
                int count = 0;
                count = School.Student.getlogin(tb_username.Text, tb_LgnPassword.Text);
                if (count > 0)
                {
                    Response.Redirect("StudentList.aspx");
                }
                else
                {
                    lb_lgnError.InnerText = ("Incorrect UserName or Password");
                    lb_lgnError.Visible = true;
                }
            }
            else
            {
                int count = 0;
                count = School.Teacher.Teacherslogin(tb_username.Text, tb_LgnPassword.Text);
                if(count>0)
                {
                    Response.Redirect("TeacherInfo.aspx");
                }
                else
                {
                    lb_lgnError.InnerText = ("Incoorect Username Password");
                    lb_lgnError.Visible = true;
                }
            }

i made it by using c# 3 tier architecture please change your code accordingly...

Posted 25-Dec-19 23:01pm

Member 14700103

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member60 · Accepted Answer · 2011-10-27T00:23:00

Solution 2

try using if condition in DropdownList1.SelectedIndexChanged() and set AutoPostBack=true

C#

if(dropdownlist1.SelectedValue=="A")
{
}

instead of

C#

if(dropdownlist1.Text)

Posted 27-Oct-11 0:23am

member60

Updated 27-Oct-11 0:29am

v4

Comments

Manisha Tambade 27-Oct-11 6:28am

ya,right answer for question.

member60 31-Oct-11 4:37am

thank u manisha

P.Salini · Accepted Answer · 2011-10-27T00:21:00

Solution 1

Did you set autopostback property of dropdown1 to <code>true or not

Posted 27-Oct-11 0:21am

P.Salini

RaisKazi · Accepted Answer · 2011-10-27T00:26:00

Set AutoPostBack property of DropDownList1 to True.

Also check by changing your code as below.

C#

if (DropDownList1.SelectedItem.Text.Equals("A"))
{
  DropDownList2.Items.Add("1");
  DropDownList2.Items.Add("2");
}

if (DropDownList1.SelectedItem.Text.Equals("B"))
{
  DropDownList2.Items.Add("3");
  DropDownList2.Items.Add("4");
}

shek124 · Accepted Answer · 2011-10-27T00:27:00

Solution 4

First you have to make the dropdownlist AutoPostback property as true

and the use the

C#

dropdownlist1.SelectedItem.Text or dropdownlist1.SelectedValue

Posted 27-Oct-11 0:27am

shek124