Equivalent in VB.Net

Question

 

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
            TextBox txtName = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtName");
 

GridView1.EditIndex = -1;
            FillCustomerInGrid();
}

What is the equivalent code in vb.net for the highlighted line?

Thank you,

Gish

 

 

Answer 1

 

TextBox txtName = DirectCast(GridView1, TextBox).Rows(e.RowIndex).FindControl("txtName")

 

or perhaps

 

TextBox txtName = DirectCast(GridView1, TextBox).Rows.Item(e.RowIndex).FindControl("txtName")

 

Answer 2

Code Snippet

Protected Sub GridView1_RowUpdating(ByVal sender As Object, ByVal e As GridViewUpdateEventArgs)
    Dim txtName As TextBox = _
       DirectCast(GridView1.Rows(e.RowIndex).FindControl("txtName"), TextBox)
    GridView1.EditIndex = -1
    FillCustomerInGrid()
End Sub

 

 

 

Answer 3

I use to use CType in these occasions. Does DirectCast is better than CType?

Thank you,

Gish

 

 

Answer 4

Borrowed from: http://www.novicksoftware.com/TipsAndTricks/tip-visual-basic-ctype-directcast-dot-net.htm

 

The difference between the two keywords is that CType succeeds as long as there is a valid conversion defined between the expression and the type and DirectCast requires that the run-time type of an object variable to be the same as the specified type that it's being cast to.  Really the same, not just that one can be converted to the other.

 

Use DirectCast if you're absolutely positively sure that an object is the specified type and the run-time type of the expression are the same.  If you're not sure but expect that the conversion will work, use CType.   The run-time performance of DirectCast is better than that of CType. However, DirectCast throws an InvalidCastException error if the argument types do not match, so you must be sure.

Answer 5

DirectCast is the equivalent of the C# type cast, so if the C# code works then DirectCast will, so it is safe to go with DirectCast.

Answer 6

Not quite.

This C# code works fine:

i = (int)someDouble;

but the following VB code will not compile:

i = DirectCast(someDouble, Integer)

 

Also, integer casts have further differences between C# and VB.

 

I wrote up some notes on this here:

http://www.tangiblesoftwaresolutions.com/Articles/VB%20Equivalent%20to%20CSharp%20Casts.htm