C# equivalent ?[Resolved]

Code:

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

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Thanks

Code:

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

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

Code:

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

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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 !:rolleyes:

this works fine :

Code:

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

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but not this :

Code:

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

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Thanks .

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.

Quote:

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VB Code:

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

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Code:

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

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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 + "".

Thank you DevGrp .:)

Or call ToString explicitly.

That's what I figured out actually !:D

Quote:

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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.

Code:

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

---

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I tried the code

Code:

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

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

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.