protected void ddlColor_SelectedIndexChanged(object sender, EventArgs e)

{

if (this.ddlColor.SelectedValue == "紅色")

{

this.txtMsg.ForeColor = Color.Red;//字型顏色

this.txtMsg.Font.Name= "仿宋_GB2312";//設定字型

this.txtMsg.Font.Size = FontUnit.Point(12);//字型大小

}

else if (this.ddlColor.SelectedValue == "黑色")

{

this.txtMsg.ForeColor = Color.Black;

this.txtMsg.Font.Size = FontUnit.Point(15);

this.txtMsg.Font.Name = "華文新魏";

}

else if (this.ddlColor.SelectedValue == "藍色")

{

this.txtMsg.ForeColor = Color.Blue;

this.txtMsg.Font.Size = FontUnit.Point(20);

this.txtMsg.Font.Name = "方正舒體";

}

else if (this.ddlColor.SelectedValue == "綠色")

{

this.txtMsg.ForeColor = Color.Green;

this.txtMsg.Font.Size = FontUnit.Point(25);

this.txtMsg.Font.Name = "方正姚體";

}

}

注意:設定DropDownList 的AutoPostBack為true;