C# equivalent ?[Resolved]

[Pirate]

Dim i As Integer
For i = 0 To flds.Length - 1
TreView.Nodes.Add(MyDataset.Tables(0).Columns.Item(i).ToString)
Next

Thanks

[DevGrp]

for(int i = 0; i < flds.Lenght - 1; i++)
{
      TreView.Nodes.Add(MyDataset.Tables[0].Columns[i].ToString());
}

[Pirate]

Thanks DevGrp , I got another one if you can help ...

If TypeOf TxtBox Is TextBox Then
TxtBox.Text = ""
End If

[Pirate]

Weird thing ! Why this works (when I add + "") but when I remove it , it won't work and says : Cannot implicitly convert type 'object' to 'string' .anyone can guess !

this works fine :

ListVItem = new ListViewItem();
ListVItem.Text = dr["C_URL"]+ "" ;

but not this :

ListVItem = new ListViewItem();
ListVItem.Text = dr["C_URL"] ;

Thanks .

[DevGrp]

The first one works because the ToString method of dr["C_URL"] is being called behind the scenes when the empty string is appended to the end. To make the one work, you have to explicity call the dr["C_URL"].ToString(). Remember every object implicitly inherits a ToString Method.

If TypeOf TxtBox Is TextBox Then
    TxtBox.Text = ""
End If

if(TxtBox is TextBox)
    TxtBox.Text = "";

[BrianHawley]

The right hand side will be evaluated before putting the value into the left hand side.

The + "" forces the right hand side to convert.

Why it can't convert implicitly is a mystery. Either they missed it or somebody decided it should work that way.

You can always use the Convert statement if you want t avoid the + "".

[Pirate]

Thank you DevGrp .

[CornedBee]

Or call ToString explicitly.

[Pirate]

That's what I figured out actually !

[session]

Originally posted by DevGrp
The first one works because the ToString method of dr["C_URL"] is being called behind the scenes when the empty string is appended to the end. To make the one work, you have to explicity call the dr["C_URL"].ToString(). Remember every object implicitly inherits a ToString Method.

if(TxtBox is TextBox)
    TxtBox.Text = "";

I tried the code

if(TxtBox is TextBox)
    TxtBox.Text = "";

but it says 'the given expression is always of the provided (Ststem.Windows.Form.TextBox) type. What does that mean?

[CornedBee]

That means that TxtBox is of reference type TextBox and therefore can't reference any object where the if clause would be false. Therefore the if is useless.