Oct 06

How To Force Force x number of rows in a GridView

asp net No Comments »

Just override the OnDataBound method and add the extra rows. In this example, the number of rows is always the same as the PageSize property and still keeping the footer row at the bottom.

protected override void OnDataBound(EventArgs e)
{
GridViewRow gvRow = null;

for (int rows = this.Rows.Count; rows < this.PageSize; rows++)
{
gvRow = new GridViewRow(0, 0, DataControlRowType.DataRow, DataControlRowState.Normal);

for (int columns = 0; columns < this.Columns.Count; columns++)
{
gvRow.Controls.Add(new TableCell());
}

//Inserts the rows right above the footer row.
//Remove the "- 1" if you are not using a footer.
this.Controls[0].Controls.AddAt(this.Controls[0].Controls.Count - 1, gvRow);
}
}
Jul 01

Reset Values of Controls in ASP Net 2.0

asp net No Comments »
A very common requirement that comes up when building a form with lot of fields is resetting the controls back to their original state. In this article, we will explore how to do this task using both ASP.NET and Javascript. I assume you know how to build web pages in asp.net 2.0.
Using ASP.NET
Step 1: Drag and drop a few controls like textboxes, radio buttons, checkboxes etc. on to the form
Step 2: Add a button to the form and rename its Text property as “Clear all controls using ASP.NET”. Rename its id property to be “btnClearASP”.
Step 3: Double click the button. In its click event, call a method that will clear the content of the controls on a Page.
protected void btnClearASP_Click(object sender, EventArgs e)
{
ResetFormControlValues(this);
}
Step 4: Write code for this method
private void ResetFormControlValues(Control parent)
{
foreach (Control c in parent.Controls)
{
if (c.Controls.Count > 0)
{
ResetFormControlValues(c);
}
else
{
switch(c.GetType().ToString())
{
case “System.Web.UI.WebControls.TextBox”:
((TextBox)c).Text = “”;
break;
case “System.Web.UI.WebControls.CheckBox”:
((CheckBox)c).Checked = false;
break;
case “System.Web.UI.WebControls.RadioButton”:
((RadioButton)c).Checked = false;
break;
}
}
}
}
The above function is a recursive function that clears the controls values on a page. I am not sure if this will work for a collection control like a RadioButtonList or similar. But I hope you have got some idea of how to write a function to reset contents on a page.
Using Javascript
Step 1: Drag and drop a few controls like textboxes, radio button, checkboxes etc. on to the form.
Step 2: Drag and drop a html button on the form. Rename it to “Clear All Controls Using Javascript”. Add an ‘OnClick’ attribute and point it to a function “ClearAllControls()” as shown below
<input id=”Button1″ type=’button’ onclick=’ClearAllControls()’ value=’Clear All Controls Using Javascript’/>

Step 3: Write code for this function ‘ClearAllControls()’.