Overview: Install the jQuery and Bootstrap CSS using the Manage NuGet Packages. In your masterpage include the bootstrap.css as a linked file. Create an global.asxa using a text editor. Set the path for the jquery and bootstrap scriptreference in the Scriptmanager component. The scriptmanager must be encapsulated by a form tag.
Master Page
<head>
<link href="/Content/bootstrap.css"
rel="stylesheet" />
<link href="/Content/overrides.css"
rel="stylesheet" />
</head>
form
<asp:ScriptManager ID="scriptManager1"
runat="server" OnLoad="ScriptManager_Onload"
ScriptMode="Release" EnableCdn="true" >
<Scripts>
<asp:ScriptReference name="jquery" />
<asp:ScriptReference name="bootstrap" />
</Scripts>
</asp:ScriptManager>
Global.asax
<script Language="vbscript" RunAt="server">
Sub application_OnStart()
Dim myScriptResDef As ScriptResourceDefinition
myScriptResDef = New ScriptResourceDefinition
myScriptResDef.Path = "/Scripts/jquery-
2.2.3.js"
myScriptResDef.DebugPath = "/Scripts/jquery-
2.2.3.js"
myScriptResDef.CdnPath =
"http://ajax.microsoft.com/ajax/jQuery/jquery-
2.2.3.min.js"
myScriptResDef.CdnDebugPath =
"http://ajax.microsoft.com/ajax/jQuery/jquery-
2.2.3.js"
ScriptManager.ScriptResourceMapping.AddDefinition
("jquery", Nothing, myScriptResDef)
myScriptResDef = New ScriptResourceDefinition
myScriptResDef.Path = "/Scripts/bootstrap.js"
myScriptResDef.DebugPath =
"/Scripts/bootstrap.js"
ScriptManager.ScriptResourceMapping.AddDefinition
("bootstrap", Nothing, myScriptResDef)
End Sub
</script>