Why does TextBox retain its values when posting in spite of having ViewState property disabled for TextBox,
Refer to the link ASP.NET: TextBox and EnableViewState=’False’
PermalinkWhy do i get the error message ‘Object must implement IConvertible’
(I don’t understand ‘tyring to insert/update data’, ‘webcontrol is not associated with it’s property’!)
//
if you write code using parametrized query as
paramxxx.value = textbox1
it’ll show above error
to resolve it it should be
paramxxx.value =textbox1.text
//This kind of error message can occur when you are trying to insert/update data or any kind of operation which involves textbox/dropdownlist
The issue occurs if the webcontrol is not associated with its property
May be you have not associated the appropriate property of the control
i.e textBox1.Text
or dropdownlist1.SelectedItem.Value
How to show TextBox web server control with TextMode Property Password as **** rather than blank
For security reason, TextBox with TextMode=’Password’ setting cannot be assigned or populated via the Text property on Page_Load or PostBack event.
It’s not recommend for to prefill a ‘Password’ type TextBox with the(‘***’) characters, though below is the solution to achieve this.
VB.NET
ViewState('Pwd')=TextBox1.Text ;
TextBox1.Attributes.Add('value', ViewState('Pwd').ToString ()) ;
C#
ViewState['Pwd']=TextBox1.Text ;
TextBox1.Attributes.Add('value', ViewState['Pwd'].ToString ()) ;
Why do I get error message ‘Option Strict On disallows implicit conversions from ‘System.Web.UI.Control’ to ‘System.Web.UI.WebControls.TextBox’.’
For type Casting apply the following steps
VB.NET
dim aprtxt as string
aprtxt= CType(e.Item.FindControl('txtapr'), TextBox)
C#
string aprtxt;
aprtxt = (TextBox) e.Item.FindControl['txtapr'];
How to allow only numeric values in a textbox using ASP.NET Validator control
<asp:TextBox id='txtNumber' Runat='server' />
<asp:RegularExpressionValidator ID='vldNumber' ControlToValidate='txtNumber' Display='Dynamic' ErrorMessage='Not a number' ValidationExpression='(^([0-9]*|\d*\d{1}?\d*)$)' Runat='server'>
</asp:RegularExpressionValidator>
How to force the max no. of characters in a multiline TextBox using RegularExpressionValidator
<asp:TextBox id='TextBox1' style='Z-INDEX: 101; LEFT: 0px; POSITION: absolute; TOP: 112px' runat='server' TextMode='MultiLine'></asp:TextBox>
<asp:RegularExpressionValidator id='RegularExpressionValidator1' style='Z-INDEX: 102; LEFT: 216px; POSITION: absolute; TOP: 112px'
runat='server' ErrorMessage='MaxLength is 20' ControlToValidate='TextBox1' ValidationExpression='^\w{1,20}
>
</asp:RegularExpressionValidator>
How to get the textbox value at the client side ?
<script lang='javascript'>
function CheckFunction()
{
if (document.getElementById(’<%=textbox2.ClientID%>’).value == '')
{
alert('Please enter a value');
return;
}
}
</script>
<asp:textbox id='textbox2' runat='Server'></asp:textbox>
<input type=button id='btn1' onclick='javascript:CheckFunction();' value='Click'>
How to right align the text in the TextBox
<asp:TextBox id='TextBox1' dir=rtl runat='server'></asp:TextBox>
How to change server control backcolor from a variable
<asp:TextBox id='TextBox1' BackColor =<%#colCon.ConvertFromString(bgcolor)%> runat='server'>
</asp:TextBox>
VB.NET
Protected colCon As New System.Drawing.ColorConverter
Protected bgcolor As String = '#556600'
’In Page_Load
Page.DataBind()
C#
protected System.Drawing.ColorConverter colCon =new System.Drawing.ColorConverter();
protected string bgcolor = '#556600';
//In Page_Load
Page.Databind();
How to display data in Textboxes using DataSet
Product ID : <asp:TextBox id='TextBox1' style='Z-INDEX: 101; LEFT: 80px; POSITION: absolute; TOP: 64px' runat='server'></asp:TextBox>
Product Name:<asp:TextBox id='TextBox2' style='Z-INDEX: 102; LEFT: 80px; POSITION: absolute; TOP: 112px' runat='server'></asp:TextBox>
VB.NET
’Populate the DataSet
’...
’Display in TextBoxes using Column Name
TextBox1.Text = ds.Tables (0).Rows(0)('ProductId').ToString ();
TextBox2.Text =ds.Tables (0).Rows(0)('ProductName').ToString ();
’Display in TextBoxes using Column Index
TextBox1.Text = ds.Tables (0).Rows(0)(0).ToString ();
TextBox2.Text =ds.Tables (0).Rows(0)(1).ToString ();
C#
//Populate the DataSet
//...
//Display in TextBoxes using Column Name
TextBox1.Text = ds.Tables [0].Rows[0]['ProductId'].ToString ();
TextBox2.Text =ds.Tables [0].Rows[0]['ProductName'].ToString ();
//Display in TextBoxes using Column Index
TextBox1.Text = ds.Tables [0].Rows[0][0].ToString ();
TextBox2.Text =ds.Tables [0].Rows[0][1].ToString ();
How to display data in Textboxes using DataReader
Id : <asp:TextBox id='TextBox1' style='Z-INDEX: 102; LEFT: 128px; POSITION: absolute; TOP: 32px' runat='server'></asp:TextBox>
Name : <asp:TextBox id='TextBox2' style='Z-INDEX: 103; LEFT: 128px; POSITION: absolute; TOP: 72px' runat='server'></asp:TextBox>
VB.NET
Dim cn As SqlConnection
Dim cmd As SqlCommand
Dim rdr As SqlDataReader
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
’ Put user code to initialize the page here
Try
cn = New SqlConnection('server=localhost;uid=sa;pwd=;database=northwind')
cmd = New SqlCommand('select * from Products where productid =1', cn)
cn.Open()
rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection)
rdr.Read()
TextBox1.Text = rdr('ProductId').ToString()
TextBox2.Text = rdr('ProductName').ToString()
Catch ex As Exception
Response.Write(ex.Message.ToString())
Finally
rdr.Close()
cn.Close()
End Try
End Sub
C#
SqlConnection cn ;
SqlCommand cmd ;
SqlDataReader rdr ;
private void Page_Load(object sender, System.EventArgs e)
{
// Put user code to initialize the page here
try
{
cn = new SqlConnection('server=localhost;uid=sa;pwd=;database=northwind');
cmd = new SqlCommand( 'select * from Products where productid=1 ', cn);
cn.Open();
rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection );
rdr.Read ();
TextBox1.Text =rdr['ProductId'].ToString ();
TextBox2.Text =rdr['ProductName'].ToString ();
}
catch (Exception ex)
{
Response.Write (ex.Message.ToString ());
}
finally
{
rdr.Close();
cn.Close();
}
}
How to create an array of Web Controls
<asp:PlaceHolder id='PlaceHolder1' runat='server'></asp:PlaceHolder>
VB.NET
Dim textboxes(5) As TextBox
Dim i As Integer
For i = 0 To 4
textboxes(i) = New TextBox()
textboxes(i).ID = 'TextBox' + i
textboxes(i).AutoPostBack = True
PlaceHolder1.Controls.Add(textboxes(i))
Next
C#
TextBox[] textboxes = new TextBox[5];
for (int i=0; i<5; i++)
{
textboxes[i] = new TextBox();
textboxes[i].ID = 'TextBox' + i;
textboxes[i].AutoPostBack = true;
PlaceHolder1.Controls.Add(textboxes[i]);
}
Is there a TextArea in ASP.NET
You can use the TextBox webserver control and set the TextMode = MultiLine
PermalinkHow to convert TextBox value into a DateTime variable
VB.NET
Dim dt As DateTime = DateTime.Parse(TextBox1.Text)
C#
DateTime dt = DateTime.Parse(TextBox1.Text);
By default Date.Parse check the date as MDY format
Refer DateTime.Parse for a specified Date Format.
I am running the query SQL=’Select name from profile where proID=1′; and I am getting the result in Dataset dsdata. How can I read the text from the dataset and assign it to textbox1.text ?
VB.NET
Textbox1.Text= dsData.Tables(0).Rows(0)('FieldName').ToString()
C#
TextBox1.Text=dsData.Tables[0].Rows[0]['FieldName'].ToString();
How to cast the value entered in a textbox to integer
How to programmatically set the width of the textbox control
How to clear all the textboxes in my form
VB.NET
Dim ctl As Control
For Each ctl In Page.Controls(1).Controls
If TypeOf ctl Is TextBox Then
CType(ctl, TextBox).Text = ''
End If
Next
C#
foreach (Control ctl in Page.Controls[1].Controls )
{
TextBox tb = ctl as TextBox;
if (tb!=null)
{
tb.Text = '' ;
}
}
Note: Page.Controls[1]=> control is within the
tag
PermalinkHow to align the Text property of the Textbox Control?
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