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ASP.NET Button Click is not working on first click when Textbox AutoPostBack is True

I have three textbox and one button. Here is my problem:
I use autopostback="true" in textbox, i entered some value and after first click of the button is not working. Then i click again, second click is working. I looked on F12 developer tool on Browser, there is no an error. When i set autopostback="false" than button click is working without any problem.
I would like to use autopostback="true" because it helps me. I think there is a focus problem because when i click out of textbox and than click on the button, button works with autopostback="true"
Do you have any idea for solution of this problem. All controls are working server-side.
<asp:Textbox ID="Name" runat="server" ValidationGroup="myval" AutoPostBack="true"></asp:Textbox>
<asp:Textbox ID="Surname" runat="server" ValidationGroup="myval" AutoPostBack="true"></asp:Textbox>
<asp:Textbox ID="City" runat="server" ValidationGroup="myval" AutoPostBack="true"></asp:Textbox>
<asp:Button ID="send_btn" runat="server Text="Check and Send" OnClick="send_btn_Click" ValidationGroup="myval"></asp:Button>

I found a solution. It's not stable solution but however it's working. I hope it helps you too. My solution is:
<asp:Button ID="send_btn" runat="server Text="Check and Send" OnClick="send_btn_Click" OnClientClick="return true;" ValidationGroup="myval"></asp:Button>
I added OnClientClick="return true;" and button click is working on first click now.
If you have better solution waiting for your response.

How to execute event when user presses return on web page

I have an ASP.NET website and I have a forgot password page where the user enters their email address in a text box and when they click the button to retrieve password, the event runs as fine.
Only problem is if the user types in their email address and presses ENTER instead, it runs a search (I have a search bar at the top of the page) and so the result comes back as 'search query not found'. But this search bar at the top is on a different ASP.NET page.
So anyway, I want the event onclick to run when the user presses enter and not run a search query. Does anyone have any ideas? I've searched on this site but not really found the answer I need.

There are couple ways you can do this. If it is a webform and you have your textbox wrapped with an asp:panel you can do as below:
<asp:Panel ID="p" runat="server" DefaultButton="myButton">
<%-- Text boxes here --%>
<asp:Button ID="myButton" runat="server" />
</asp:Panel>
If its not a webform or you want to move away from that try below:
<asp:TextBox ID="TextBox1" runat="server" onkeypress="return EnterEvent(event)"></asp:TextBox>
<asp:Button ID="Button1" runat="server" style="display:none" Text="Button" />
function EnterEvent(e) {
if (e.keyCode == 13) {
__doPostBack('<%=Button1.UniqueId%>', "");
}
}
And in the codebehind fire your button click in the page load based on the parameters of the postback.

Specify the "defaultbutton" property to the ID of (event you want to fire).
You can specify the "defaultbutton" property at the Form level (in the form tag)
Or else you can define them at panel level in the tag.
The form level setting is overridden at the panel level setting.
The Event Handler for the specified button gets fired simulating a true submit button functionality.
<form id="sampleform" runat="server" defaultbutton="button1">
<div>
<asp:TextBox ID="textBox1" runat="server"></asp:TextBox>
<asp:Button ID="button2" runat="server" Text="Cancel" OnClick="Button2_Click" />
<asp:Button ID="button1" runat="server" Text="Ok" OnClick="button1_Click" />
<asp:Panel ID="panel1" runat="server" defaultbutton="Button5">
<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
<asp:TextBox ID="TextBox5" runat="server"></asp:TextBox>
<asp:Button ID="Button5" runat="server" Text="Button5" OnClick="Button5_Click" />
</asp:Panel>
</div>
</form>
In this example, Button1 is the default button for the form (Type something in Textbox 1 and hit enter, button1_Click gets fired). But for "Panel 1", default button will be Button 5 (Type in Textbox3 or Textbox 5 and hit enter).
You can have any number of panels with different default button for each panel.

Adding an ASP Panel around the text box and button with the id of the button name as the property for DefaultButton was the best way to do this.
<asp:Panel ID="p" runat="server" DefaultButton="myButton">
<%-- Text boxes here --%>
<asp:Button ID="myButton" runat="server" />
</asp:Panel>

how to use a asp.net validator with two buttons, but one textbox

i have two asp:LinkButton and one asp:TextBox + one asp:RegularExpressionValidator on my page.
<asp:LinkButton runat="server" ID="lbNearEventSearch" Text="<%# NearEventText %>" OnClick="NearEventSearch_Click" />
<asp:TextBox runat="server" ID="tbEventSearch" onfocus="clearIt(this)" onblur="setIt(this)" CssClass="addontextfield" MaxLength="5" />
<asp:LinkButton runat="server" ID="lbEventSearch" CssClass="addonbutton" OnClick="EventSearch_Click" />
<asp:RegularExpressionValidator runat="server" ID="EventSearchValidator" ControlToValidate="tbEventSearch" Enabled="false" ErrorMessage="<%# ErrorMessageText %>" ValidationExpression="[0-9]{4}" Display="Dynamic" />
i'd like to restrict the validator to only run when the user clicks on the "lbEventSearch" button and do nothing when the other button is clicked.
on pageload there is no way to know witch button was clicked, right? And the onclick callbacks fire after the validator.
All I can think of is disable the validator and enable it inside the onclick callbacks.
but I wonder if there would be a better way.
thanks

Just set CausesValidation="false" on lbNearEventSearch.

You can use ValidationGroup for this:
<asp:TextBox runat="server" ID="tbEventSearch" onfocus="clearIt(this)" onblur="setIt(this)" CssClass="addontextfield" MaxLength="5" />
<asp:LinkButton runat="server" ID="lbEventSearch" CssClass="addonbutton" OnClick="EventSearch_Click"
ValidationGroup="SearchVG" />
<asp:RegularExpressionValidator runat="server" ID="EventSearchValidator" ControlToValidate="tbEventSearch" Enabled="false" ErrorMessage="<%# ErrorMessageText %>" ValidationExpression="[0-9]{4}" Display="Dynamic"
ValidationGroup="SearchVG" />
Now only controls with specified group (in this case lbEventSearch) will trigger validation on the corresponding validators.

Just give same validationGroup to all elements and lbEventSearch button and dont set validationGroup to other buttons. you can set validation group from property panel

ASP Drop Down collapses after first click

I have an ASP Drop Down List that opens then immediately collapses on one click. I'm using a Drop Down on another page with the same CssClass, and it's working fine (first click expands the DDL and the second click collapses it). Anyone have any idea what could be happening? I would greatly appreciate any suggestions or input.
<label>
<asp:RadioButton ID="rbToAccount" runat="server" GroupName="rbTo" />
Account
<asp:DropDownList ID="ddlToAccount" runat="server" CssClass="span4 m-wrap">
</asp:DropDownList>
</label>

Try This :
<label></label>
<asp:RadioButton ID="rbToAccount" runat="server" GroupName="rbTo" />
Account
<asp:DropDownList ID="ddlToAccount" runat="server" CssClass="span4 m-wrap">
</asp:DropDownList>

is the event tied to a Jquery function??
It sounds like on dropdown list change it is causing a postback, which then is refreshing the page to it's original state. Try adding OnClientClick="return false" as an attribute to the ddl control

Radionbuttons checking in ASP.NET

It's possible check if one of radio buttons named of 'foo' is selected? For example:
<input type="radio" name="foo" id="baa" value="..." runat="server" />
<input type="radio" name="foo" id="baa1" value="....." runat="server" />
the question is: Is there some <asp:.. that can test if one(not both, only one can be selected) of above checkbox if selected?
I hope this is clear. Thanks in advance.

EDIT
For you requirement it better to go for RadioButtonList with RequiredFieldValidator. Below is example
<asp:RadioButtonList
ID="RadioButtonList1"
runat="server"
RepeatColumns="3">
<asp:ListItem>abcd</asp:ListItem>
<asp:ListItem>xyz</asp:ListItem>
</asp:RadioButtonList>
<asp:RequiredFieldValidator
ID="ReqiredFieldValidator1"
runat="server"
ControlToValidate="RadioButtonList1"
ErrorMessage="select atleast one radiobutton!">*
</asp:RequiredFieldValidator>
You need to group radio button GroupName="foo" is group in which two radio button resides , so at a time only one get slected
<asp:panel runa="server" id="container">
<asp:RadioButton id="Radio1" GroupName="foo"
Text="Beef" BackColor="Pink" runat="server"/>
<br />
<asp:RadioButton id="Radio2" GroupName="foo"
Text="Pork" BackColor="Pink" runat="server"/>
</asp:panel>
Note even in your html you need to specify groupname for the radio button to select one out of the group of radio button
To check ratio button selected or not just use this linq operation
bool isradchecked=container.Controls.OfType<RadioButton>)
.Any(r => r.Checked);
here container of radiobutton is Asp:Panel.