Develop Reference

Clear Data in chart c#

I want to create a delete button so when i press the delete button i can key in a new set of data and let it generate a new chart
private void button2_Click(object sender, EventArgs e)
{
chart1.Series.Clear();
}
and I had tried
private void button2_Click(object sender, EventArgs e)
{
chart1.Series["Data1"].Points.Clear();
chart1.Series["Data2"].Points.Clear();
chart1.Series["Total"].Points.Clear();
}
What I have did so far

How do I check the contents of a TextBox?

I have a textbox. In that textbox I write Human. Then I click a button, and if the word is human, then on a richtextbox, the word human will appear.
Here's the code I've tried.
private void button3_Click(object sender, EventArgs e)
{
if (textBox4.Text)
{
richTextBox1.Text = "human";
}
}
private void textBox4_TextChanged(object sender, EventArgs e)
{
string value = textBox4.Text;
}
I tried making the textbox into a string so I could use it in the if statement, but it didn't work, so instead I used texbox4.text, but it is still wrong.

You could simply do with this piece of code,
private void button1_Click(object sender, EventArgs e)
{
if(textBox1.Text =="human")
{
richTextBox1.Text = textBox1.Text;
}
}

Invoking google search button

My application has one button one text box and a webbrowser control which is going to navigate at google.com at form load event.
If I am setting the text attributes to the google textbox in webBrowser1_DocumentCompleted method after clicking the button I am able to invoke google search button.
private void Form1_Load(object sender, EventArgs e)
{
webBrowser1.Navigate("https://www.google.co.in/?gfe_rd=cr&ei=u6PkV4X9LovZ8Aec7bI4&gws_rd=ssl");
webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);
}
void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
textElement = webBrowser1.Document.All.GetElementsByName("q")[0];
textElement.SetAttribute("value", "facebook");
}
private void btnLogin_Click(object sender, EventArgs e)
{
ele = webBrowser1.Document.All.GetElementsByName("btnK")[0];
ele.InvokeMember("click");
}
If I am setting the text attributes to the google textbox in btnLogin_Click method after clicking the button i am not able to invoke google search button.
private void Form1_Load(object sender, EventArgs e)
{
webBrowser1.Navigate("https://www.google.co.in/?gfe_rd=cr&ei=u6PkV4X9LovZ8Aec7bI4&gws_rd=ssl");
webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);
}
void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
textElement = webBrowser1.Document.All.GetElementsByName("q")[0];
}
private void btnLogin_Click(object sender, EventArgs e)
{
textElement.SetAttribute("value", "facebook");
ele = webBrowser1.Document.All.GetElementsByName("btnK")[0];
ele.InvokeMember("click");
}
Where I am going wrong please suggest me.

Asp.net Session state Trying to keep contents of textbox when returned to page

ive two pages, one with a text box and a button, the other with a button a label. What i want to do is to display contents of the textbox on page 1, in the label of the page2 on button click. and then when i click the button to return to page1. preverse whats entered in the textbox on page1. sorry if its confusing. heres my code
page1.aspx
protected void Button1_Click(object sender, EventArgs e)
{
Session["fstName"] = txtBox.Text;
Response.Redirect("Page2.aspx");
}
page2.aspx
protected void Page_Load(object sender, EventArgs e)
{
string a = Session["fstName"].ToString();
lblPage2.Text = a;
}
protected void Button1_Click(object sender, EventArgs e)
{
Response.Redirect("WebForm1.aspx");
}

Where do you set the value of the text box when returning to WebForm1.aspx? It should be very similar to what you have for the label on Page2.aspx. Something like:
protected void Page_Load(object sender, EventArgs e)
{
string a = Session["fstName"].ToString();
txtBox.Text = a;
}
At worst, you may need to wrap some error checking around it. Maybe something like:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
if (Session["fstName"] != null)
{
string a = Session["fstName"].ToString();
txtBox.Text = a;
}
}

asp:textbox.text not displayed

I have an asp:textbox with id=login
I am trying to display the user id retrieved from a post request:
protected void Page_Load(object sender, System.EventArgs e)
{
login.Text = Request["user"];
}
During debug, I can see that login.Text is populated with the user id, but the text is never displayed on the page.
Any help will be greatly appreciated!

try:
protected void Page_Load(object sender, System.EventArgs e)
{
if (!this.IsPostBack)
{
login.Text = Request["user"];
}
}