Value of '0' is not valid for 'SelectedIndex'

[Andrus]

To reproduce, run the code.

Observed:
System.Argument OutOfRangeExcep tion was unhandled
Message="Invali dArgument=Value of '0' is not valid for
'SelectedIndex' .\r\nParameter name: SelectedIndex"

t2.c1 contains legal value.
Why this error occurs ?
How to fix ?

Andrus.
using System.Windows. Forms;
using System.Data;
using System;
class testForm : Form {

testForm() {
DataTable t = new DataTable();
t.Columns.Add(" displaymember") ;
t.Columns.Add(" valuemember");
t.Rows.Add("low er", "l");

ComboBox comboBox1 = new ComboBox();
comboBox1.Displ ayMember = "displaymember" ;
comboBox1.Value Member = "valuemembe r";
comboBox1.DataS ource = t;
comboBox1.AutoC ompleteSource = AutoCompleteSou rce.ListItems;
comboBox1.AutoC ompleteMode = AutoCompleteMod e.SuggestAppend ;

DataTable t2 = new DataTable();
t2.Columns.Add( "c1");
t2.Rows.Add("l" );
comboBox1.DataB indings.Add("Se lectedValue", t2, "c1");
Controls.AddRan ge(new Control[] { comboBox1 });
}

[STAThread]
static void Main() {
Application.Run (new testForm());
}
}

[Kevin Spencer]

It isn't legal if it's a string.

--
HTH,

Kevin Spencer
Microsoft MVP

Printing Components, Email Components,
FTP Client Classes, Enhanced Data Controls, much more.
DSI PrintManager, Miradyne Component Libraries:
http://www.miradyne.net

"Andrus" <ko********@hot .eewrote in message
news:eM******** ******@TK2MSFTN GP05.phx.gbl...

To reproduce, run the code.

Observed:
System.Argument OutOfRangeExcep tion was unhandled
Message="Invali dArgument=Value of '0' is not valid for
'SelectedIndex' .\r\nParameter name: SelectedIndex"

t2.c1 contains legal value.
Why this error occurs ?
How to fix ?

Andrus.
using System.Windows. Forms;
using System.Data;
using System;
class testForm : Form {

testForm() {
DataTable t = new DataTable();
t.Columns.Add(" displaymember") ;
t.Columns.Add(" valuemember");
t.Rows.Add("low er", "l");

ComboBox comboBox1 = new ComboBox();
comboBox1.Displ ayMember = "displaymember" ;
comboBox1.Value Member = "valuemembe r";
comboBox1.DataS ource = t;
comboBox1.AutoC ompleteSource = AutoCompleteSou rce.ListItems;
comboBox1.AutoC ompleteMode = AutoCompleteMod e.SuggestAppend ;

DataTable t2 = new DataTable();
t2.Columns.Add( "c1");
t2.Rows.Add("l" );
comboBox1.DataB indings.Add("Se lectedValue", t2, "c1");
Controls.AddRan ge(new Control[] { comboBox1 });
}

[STAThread]
static void Main() {
Application.Run (new testForm());
}
}

[Andrus]

Kevin,

thank you.
The code does not set SelectedIndex as all.

Why .NET tries to set SelectedIndex to invalid value ?

Andrus.

It isn't legal if it's a string.

>>
Observed:
System.Argumen tOutOfRangeExce ption was unhandled
Message="Inval idArgument=Valu e of '0' is not valid for
'SelectedIndex '.\r\nParameter name: SelectedIndex"

t2.c1 contains legal value.
Why this error occurs ?
How to fix ?

Andrus.
using System.Windows. Forms;
using System.Data;
using System;
class testForm : Form {

testForm() {
DataTable t = new DataTable();
t.Columns.Add(" displaymember") ;
t.Columns.Add(" valuemember");
t.Rows.Add("low er", "l");

ComboBox comboBox1 = new ComboBox();
comboBox1.Displ ayMember = "displaymember" ;
comboBox1.Value Member = "valuemembe r";
comboBox1.DataS ource = t;
comboBox1.AutoC ompleteSource = AutoCompleteSou rce.ListItems;
comboBox1.AutoC ompleteMode = AutoCompleteMod e.SuggestAppend ;

DataTable t2 = new DataTable();
t2.Columns.Add( "c1");
t2.Rows.Add("l" );
comboBox1.DataB indings.Add("Se lectedValue", t2, "c1");
Controls.AddRan ge(new Control[] { comboBox1 });
}

[STAThread]
static void Main() {
Application.Run (new testForm());
}
}

[=?windows-1257?Q?G=F6ran_Andersson?=]

Andrus wrote:

To reproduce, run the code.

Observed:
System.Argument OutOfRangeExcep tion was unhandled
Message="Invali dArgument=Value of '0' is not valid for
'SelectedIndex' .\r\nParameter name: SelectedIndex"

t2.c1 contains legal value.
Why this error occurs ?
How to fix ?

Andrus.
using System.Windows. Forms;
using System.Data;
using System;
class testForm : Form {

testForm() {
DataTable t = new DataTable();
t.Columns.Add(" displaymember") ;
t.Columns.Add(" valuemember");
t.Rows.Add("low er", "l");

ComboBox comboBox1 = new ComboBox();
comboBox1.Displ ayMember = "displaymember" ;
comboBox1.Value Member = "valuemembe r";
comboBox1.DataS ource = t;
comboBox1.AutoC ompleteSource = AutoCompleteSou rce.ListItems;
comboBox1.AutoC ompleteMode = AutoCompleteMod e.SuggestAppend ;

DataTable t2 = new DataTable();
t2.Columns.Add( "c1");
t2.Rows.Add("l" );
comboBox1.DataB indings.Add("Se lectedValue", t2, "c1");
Controls.AddRan ge(new Control[] { comboBox1 });
}

[STAThread]
static void Main() {
Application.Run (new testForm());
}
}

You can't select a specific item from a combobox that doesn't contain
any items at all.

You haven't databound the combobox, so it doesn't contain any items.

--
Göran Andersson
_____
http://www.guffa.com

[=?windows-1257?Q?G=F6ran_Andersson?=]

Andrus wrote:

Kevin,

thank you.
The code does not set SelectedIndex as all.

Why .NET tries to set SelectedIndex to invalid value ?

Andrus.

You are setting the SelectedValue property. That will basically look for
the value among the items, and set the SelectedIndex property for the
matching item.

--
Göran Andersson
_____
http://www.guffa.com

[Tom Spink]

Andrus wrote:

To reproduce, run the code.

Observed:
System.Argument OutOfRangeExcep tion was unhandled
Message="Invali dArgument=Value of '0' is not valid for
'SelectedIndex' .\r\nParameter name: SelectedIndex"

t2.c1 contains legal value.
Why this error occurs ?
How to fix ?

Andrus.
using System.Windows. Forms;
using System.Data;
using System;
class testForm : Form {

testForm() {
DataTable t = new DataTable();
t.Columns.Add(" displaymember") ;
t.Columns.Add(" valuemember");
t.Rows.Add("low er", "l");

ComboBox comboBox1 = new ComboBox();
comboBox1.Displ ayMember = "displaymember" ;
comboBox1.Value Member = "valuemembe r";
comboBox1.DataS ource = t;
comboBox1.AutoC ompleteSource = AutoCompleteSou rce.ListItems;
comboBox1.AutoC ompleteMode = AutoCompleteMod e.SuggestAppend ;

DataTable t2 = new DataTable();
t2.Columns.Add( "c1");
t2.Rows.Add("l" );
comboBox1.DataB indings.Add("Se lectedValue", t2, "c1");
Controls.AddRan ge(new Control[] { comboBox1 });
}

[STAThread]
static void Main() {
Application.Run (new testForm());
}
}

Hi,

This is *totally* a guess, because I haven't tried your code, but try moving
this line:

comboBox1.DataS ource = t;

So it immediately follows this line:

ComboBox comboBox1 = new ComboBox();

--
Tom Spink
University of Edinburgh