textbox填入后验证输入的合法或根据输入的内容失去焦点后立即得出其他信息

<x:SimpleForm ID="SimpleForm1" runat="server" EnableBackgroundColor="true" ShowBorder="False"
BodyPadding="2px" ShowHeader="False">
<Items>
<x:Panel ID="Panel3" ShowHeader="false" ShowBorder="false" EnableBackgroundColor="true"
BodyPadding="2px" Layout="Column" runat="server">
<Items>
<x:Label ID="Label14" Width="90px" runat="server" ShowLabel="false" Text="教工号：" EncodeText="false"
CssClass="inline" ShowRedStar="true" >
</x:Label>
<x:TextBox ID="txtEmployeeNumber" runat="server" CssClass="mright" Required="true"
Width="200px" AutoPostBack="true" OnTextChanged="textChanged_Click">
</x:TextBox>
<x:Label ID="Label2" Width="90px" runat="server" ShowLabel="false" Text="姓名：" EncodeText="false"
CssClass="inline" ShowRedStar="true">
</x:Label>
<x:TextBox ID="txtName" runat="server" CssClass="mright" Required="true"
Width="200px">
</x:TextBox>
</Items>
</x:Panel>
<x:Panel ID="Panel4" ShowHeader="false" ShowBorder="false" EnableBackgroundColor="true"
BodyPadding="2px" Layout="Column" runat="server">
<Items>
<x:Label ID="Label6" Width="90px" runat="server" ShowLabel="false" Text=" 性别：" EncodeText="false"
CssClass="inline" ShowRedStar="true">
</x:Label>
<x:RadioButton ID="rbtnNan" GroupName="MyRadioGroup1" Label=" " LabelSeparator="" Checked="true"
Width="105px" Text="男" runat="server">
</x:RadioButton>
<x:RadioButton ID="rbtnNv" GroupName="MyRadioGroup1" Label=" " LabelSeparator=""
Width="105px" Text="女" runat="server">
</x:RadioButton>
<x:Label ID="Label3" Width="90px" runat="server" ShowLabel="false" Text="出生日期：" EncodeText="false"
CssClass="inline" ShowRedStar="true">
</x:Label>
<x:DatePicker ID="txtBirthday" runat="server" DateFormatString="yyyy-MM-dd"  Required="true"
Width="200px">
</x:DatePicker>
</Items>
</x:Panel>

<x:Panel ID="Panel5" ShowHeader="false" ShowBorder="false" EnableBackgroundColor="true"  BodyPadding="2px"
Layout="Column" runat="server">
<Items>
<x:Label ID="Label7" Width="90px" runat="server" ShowLabel="false" Text="身份证：" EncodeText="false"
CssClass="inline" ShowRedStar="true">
</x:Label>
<x:TextBox ID="txtIDCard" runat="server" CssClass="mright" Required="true" Width="200px" EmptyText="请输入18位的身份证号" RegexPattern="IDENTITY_CARD" RegexMessage="请输入正确的18位身份证号码" >
</x:TextBox>
<x:Label ID="Label9" Width="90px" runat="server" ShowLabel="false" Text="部门：" EncodeText="false"
CssClass="inline" ShowRedStar="true">
</x:Label>
<x:TextBox ID="txtPart" runat="server" CssClass="mright" Required="true"
Width="200px">
</x:TextBox>

</Items>
</x:Panel>
</Items>
</x:SimpleForm>
</Items>
</x:GroupPanel>

OnTextChanged="textChanged_Click"
后台代码：

protected void textChanged_Click(object sender, EventArgs e)
{
if (txtEmployeeNumber.Text.Trim() != "")
{
employeeBLL.GetEmployeeInfoByEmployeeNumber(txtEmployeeNumber.Text.Trim());
if (employeeBLL.GetEmployeeInfoByEmployeeNumber(txtEmployeeNumber.Text.Trim()) == null)
{
Alert.Show("对不起，你的信息还没有填入教师信息表，请联系管理员！", MessageBoxIcon.Error);
}
else
{
txtName.Text = employeeBLL.GetEmployeeInfoByEmployeeNumber(txtEmployeeNumber.Text.Trim()).Name;
txtPart.Text = employeeBLL.GetEmployeeInfoByEmployeeNumber(txtEmployeeNumber.Text.Trim()).Part;
txtIDCard.Text = employeeBLL.GetEmployeeInfoByEmployeeNumber(txtEmployeeNumber.Text.Trim()).IDcard;
txtBirthday.Text = employeeBLL.GetEmployeeInfoByEmployeeNumber(txtEmployeeNumber.Text.Trim()).Birthday.ToString("yyyy-MM-dd");

}

}
}