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<asp:TextBox ID="TextBox5" CssClass="input1_net" runat="server" onpropertychange="if(this.value.length>50){this.value=this.value.slice(0,50)}"> </asp:TextBox>
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MaxLenthÊôÐÔ

C# code:
private void tb1_TextChanged(object sender, EventArgs e)
{
if(this.tb1.MaxLength>=50)
MessageBox.Show("Length >= 50!");
}


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function checkLength(which) {
            var maxChars = 20;
            if (which.value.length > maxChars)
                which.value = which.value.substring(0,maxChars);
                var curr = maxChars - which.value.length;
            }
    </script&


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Form2 f=new Form2();
f.Show();
this.Close();

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f.Show();
this.Close();
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