delete record in database(one tire)

your database like
    database name :student
    table name        :tbl_StudentData
    Field name         :id,name,age,gender,city,phone

Your .aspx page
         
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<div>

    Enter ID for delete record :

    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br/>

    <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Delete" />

</div>

--> Copy following code in your .aspx.cs file

--> if you want to delete record in table or database that time add following namespace in your code behind file
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using System.Data;

using System.Data.SqlClient;

--> and then create following  object above page load event
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     SqlConnection cn;

    SqlCommand cmd;

    SqlDataAdapter da;

    DataSet ds;

--> next assign the connection string in page laod event
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cn = new SqlConnection(@"DataSource=\student.mdf;Integrated Security=True;User Instance=True");

--> and then write following code in your code behind on click event
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        int i = Convert.ToInt32(TextBox1.Text);

        cmd = new SqlCommand("delete from tbl where id='" + i + " '", cn);

        cn.Open();

        cmd.ExecuteNonQuery();

        cn.Close();