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asp .net C# how do you set dropdownlist in page load if (!Page.IsPostBack)

Posted on 2009-04-06
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Last Modified: 2012-08-13
Expert: I have a Formview with a dropdownlist that is loaded by the database. However when the page is first loaded I want to set the dropdownlist to say "expert". I tried the following with no luck:  --> could you please show me the correct way to do this?
if (!Page.IsPostBack)
        {
            FormView form = FindControl("expertform) as FormView;
            DropDownList Ddl =
                    form .FindControl("mydropdown_Ddl") as DropDownList;
            mydropdown_Ddl.SelectedValue = "expert";
    }
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Question by:tcmmaxt
  • 4
  • 2
7 Comments
 
LVL 27

Expert Comment

by:nmarun
ID: 24079219
You need to do:

mydropdown_Ddl.Items.FindByValue          ( "expert" ).Selected = true;
0
 
LVL 6

Assisted Solution

by:Allamz
Allamz earned 600 total points
ID: 24079262
Hello tcmmaxt,

Please use the following code instead of  mydropdown_Ddl.SelectedValue = "expert";

Best Regards,

Mohamed Allam
Senior Solution Developer
mydropdown_Ddl.SelectedText= "expert";

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LVL 27

Expert Comment

by:nmarun
ID: 24079532
Allamz, asp.net dropdownlists do not have a property called '.SelectedText'. I think you meant '.SelectedItem.Text' and that won't work either as it'll just add 'expert' to the list if it doesn't exist.

       tcmmaxt, I think the best way out is:

            if(dgTest1.Items.FindByValue("1") != null)
            {
                dgTest1.Items.FindByValue("1").Selected = true;
            }
            else
            {
                dgTest1.SelectedIndex = 0;
            }
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Author Comment

by:tcmmaxt
ID: 24079859
  if (!Page.IsPostBack)
        {
            FormView form = FindControl("expertform) as FormView;
            DropDownList Ddl =
                    form .FindControl("mydropdown_Ddl") as DropDownList;
      #1      Ddl.SelectedText = "expert";  NO  LUCK
       #2       Ddl.Items.FindByValue ( "expert" ).Selected = true;  NO LUCK

Object reference not set to an instance of an object???  Maybe cannot find "expert" since it's loaded in dropdownlist by database table same time page is loaded?

           
    }


            CountryDdl.Items.FindByText("United States").Selected = true;  


           //CountryDdl.SelectedText= "United States";
0
 
LVL 27

Accepted Solution

by:
nmarun earned 1400 total points
ID: 24079887
Tom, I'm sorry about the mistake, but did you try the code:

           if(mydropdown_Ddl.Items.FindByValue("expert") != null)
            {
                mydropdown_Ddl.Items.FindByValue("expert").Selected = true;
            }
            else
            {
                mydropdown_Ddl.SelectedIndex = 0;
            }
             
0
 

Author Comment

by:tcmmaxt
ID: 24090454
no luck: above
0
 
LVL 27

Expert Comment

by:nmarun
ID: 24090480
What message do you get?
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