Hi bhushan98,
I have created sample code which full-fill your requirement.
HTML
<div>
<asp:Panel ID="pnlTextBoxes" runat="server">
<asp:TextBox ID="TextBox" class="Textclass" runat="server" />
<br />
<br />
<asp:TextBox ID="TextBox1" class="Textclass" runat="server" />
<br />
<br />
<asp:TextBox ID="TextBox2" class="Textclass" runat="server" />
<br />
<br />
<asp:TextBox ID="TextBox3" class="Textclass" runat="server" />
<br />
<br />
<asp:TextBox ID="TextBox4" class="Textclass" runat="server" />
</asp:Panel>
<br />
<asp:Button ID="btnUpdate" Text="UpdateText" Class="btnClass" OnClick="OnUpdate"
runat="server" />
</div>
C#
protected void OnUpdate(object sender, EventArgs e)
{
string variable = "My Text";
foreach (TextBox textBox in pnlTextBoxes.Controls.OfType<TextBox>())
{
textBox.Text = variable;
}
}
Vb.net
Protected Sub OnUpdate(sender As Object, e As EventArgs)
Dim variable As String = "My Text"
For Each textBox As TextBox In pnlTextBoxes.Controls.OfType(Of TextBox)()
textBox.Text = variable
Next
End Sub
Screenshot