Question 85878 in ASP.NET Question posted in
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Getting Values from 2 different Textboxes and finding the Average of it in the Third Textbox – Asp.net

protected void TextBox6_TextChanged(object sender, EventArgs e)
        {
            if (!String.IsNullOrEmpty(TextBox4.Text) && String.IsNullOrEmpty(TextBox5.Text))
            {
                TextBox6.Text = Convert.ToString(Convert.ToInt32(TextBox5.Text) +            Convert.ToInt32(TextBox4.Text) / 2).To String();
            }

        }

TextBox6 Is Not giving me any Answer, AutopostBack is set to "True".

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2

Answers


  1. 0

    Division operations have a higher priority than sum operations.
    I would recommend to add an extra parenthesis:

    ( this>(Convert.ToInt32(TextBox5.Text) + Convert.ToInt32(TextBox4.Text) )<this / 2)

    Anyhow, your method will update TextBox6, whenever TextBox6 changes.
    This will not work.

    I recommend having a different method (e.g: private void DoSum()) and call this from both TextBox4_TextChanged and TextBox5_TextChanged.

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  2. 0

    You have your 2nd isnull test without a ! (not) missing.

    However, text boxes never return null, so this would be better:

    First, the markup:

    Text4:
<asp:TextBox ID="TextBox4" runat="server" 
    AutoPostBack="true"
    OnTextChanged="TextBox4_TextChanged">
</asp:TextBox>
<br />
Text5:
<asp:TextBox ID="TextBox5" runat="server"
    AutoPostBack="true"
    OnTextChanged="TextBox4_TextChanged"
    ></asp:TextBox>
<br />
<h3>Result box</h3>
Text6:<asp:TextBox ID="TextBox6" runat="server">
</asp:TextBox>

    And code behind:

    protected void TextBox4_TextChanged(object sender, EventArgs e)
{
    // both text4 and text 5 have ontextchange = this event
    if (TextBox4.Text != "" & TextBox5.Text !="")
    {
        TextBox6.Text = 
            (
            (
            Convert.ToDouble(TextBox4.Text) + 
            Convert.ToDouble(TextBox5.Text)
            ) / 2
            ).ToString();
    }
}

    result:

    enter image description here

    Edit: Some other code set the 2 values in the text box

    Ok, so then say (for example) some code (say a button) sets the 2 values, then we would have this code:

    First, our markup:

        Text4:
    <asp:TextBox ID="TextBox4" runat="server" >
    </asp:TextBox>
    <br />
    Text5:
    <asp:TextBox ID="TextBox5" runat="server">

    </asp:TextBox>
    <br />
    <h3>Result box</h3>
    Text6:<asp:TextBox ID="TextBox6" runat="server">
    </asp:TextBox>
<br />

<asp:Button ID="Button1" runat="server" 
    Text="set the 2 text boxes" 
    OnClick="Button1_Click" />

    so, I just dropped in a button, but "some how" and "some palce" those 2 textboxes will get a value set.

    however, when you set a textbox (with code), then that those text box events don’t THEN fire for you. Those control events ONLY fire when the user changes them, NOT code behind.

    So, if a bunch of code is going to update (or fill or set) some values on a page, and you need some calulations to occur?

    Then build a "calulator" routine for the page that does all the math etc. for all the controls.

    Thus our code becomes this:

        void CalulatorCode()
    {
        TextBox6.Text =
            (
            (
            Convert.ToDouble(TextBox4.Text) +
            Convert.ToDouble(TextBox5.Text)
            ) / 2
            ).ToString();

    }

    protected void Button1_Click(object sender, EventArgs e)
    {

        TextBox4.Text = "123";
        TextBox5.Text = "456";
        CalulatorCode();

    }

    So, if the controls are to have some values, then yes, YOU the developer will have to write/have/use code to call the calculation routines. just setting the values from code will not trigger any event code attached to each control.

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