Beginning SharePoint Web Part Development - A better web part with event handling: explanation
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As Visual Studio 2008 doesn’t support a designer for developing Sharepoint web parts, we have to create all controls from scratch. We need to create a table having three rows with two columns (to hold six controls). Each of those controls must be added to each of those cells. Finally, the table must be added to page. The following explains how to do this in a step by step manner.
The first step is to create a table to hold all the controls. The following code does the same:
Dim tbl As New Table
Dim tRow1 As New TableRow
Dim tRow2 As New TableRow
Dim tRow3 As New TableRow
The above code creates a new table with three rows (rows are not added to table yet). Next, we need to create cells for each row.
Dim tR1C1 As New TableCell
Dim tR1C2 As New TableCell
Dim tR2C1 As New TableCell
Dim tR2C2 As New TableCell
Dim tR3C1 As New TableCell
Dim tR3C2 As New TableCell
Now we add the cells to their respective rows:
tRow1.Cells.Add(tR1C1)
tRow1.Cells.Add(tR1C2)
tRow2.Cells.Add(tR2C1)
tRow2.Cells.Add(tR2C2)
tRow3.Cells.Add(tR3C1)
tRow3.Cells.Add(tR3C2)
Then we add the rows to the table:
tbl.Rows.Add(tRow1)
tbl.Rows.Add(tRow2)
tbl.Rows.Add(tRow3)
Next, we create instances of the controls, provide values to properties and add event handlers (if any):
Dim txtFirst As New TextBox
txtFirst.ID = "txtFirst"
Dim txtSecond As New TextBox
txtSecond.ID = "txtSecond"
Dim lblFirst As New Label
lblFirst.Text = "Enter first:"
Dim lblSecond As New Label
lblSecond.Text = "Enter second:"
Dim lblResult As New Label
lblResult.ID = "lblResult"
Dim btnSubmit As New Button
btnSubmit.Text = "Submit"
AddHandler btnSubmit.Click, AddressOf btnSubmit_click
Now we add controls to their respective cells:
tR1C1.Controls.Add(lblFirst)
tR1C2.Controls.Add(txtFirst)
tR2C1.Controls.Add(lblSecond)
tR2C2.Controls.Add(txtSecond)
tR3C1.Controls.Add(btnSubmit)
tR3C2.Controls.Add(lblResult)
Finally, we add the table to a page (say, web part):
Me.Controls.Add(tbl)
The output of the web part should look like the following image:
Next: Debugging a WSS 3.0 web part using Visual Studio 2008 >>
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