how the can this be incrmented and inserted to table?

create table gir(idno integer unique, fname varchar(30))
insert into gir values(1,'mam')
then i want to enter name from an input form but the idno must enter internally by incrementing its previous values. means i have only one textbox to enter name ,but the idno should enter internally by incrementing the idno of its previous so how can i do this?
Private Sub cmdSubmit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdSubmit.Click

Dim con As SqlConnection
Dim cmd As SqlCommand
Dim str As String

con = New SqlConnection("server=(local);database=master;uid=sa;pwd=test;")
cmd = New SqlCommand(str, con)
con.Open()


str = "insert into gir values('" & idno& "','" & txtfname.Text & "')"
cmd.CommandText = str
cmd.ExecuteNonQuery()
con.Close()
End Sub
how the value of idno number calculated?

Left it for SQL server to do it for you. In the Design mode of table, Set the Identity, Identity Seed and Identity Increment to Yes, 1 and 1 respectively, of the idno column, or whatever be the name of the column. I am assuming it to be idno.

If you want to do it programmatically (though not recommended), get the MAX value of idno column, increment it and then pass it to your INSERT command.

Code:

---

Dim con As SqlConnection

Dim str As String

con = New SqlConnection("server=(local);database=master;uid=sa;pwd=test;")

Dim lastIdNo as Integer

str = "SELECT MAX(idno) FROM gir"

Dim cmd1 as SqlCommand
cmd1 = New SqlCommand(str, con);
cmd1.CommandText = str

con.Open()
lastIdNo = cmd.ExecuteScalar()
con.Close()

Dim cmd As SqlCommand
str = "insert into gir values('" & lastIdNo + 1 & "','" & txtfname.Text & "')"
cmd = New SqlCommand(str, con)
cmd.CommandText = str

con.Open()
cmd.ExecuteNonQuery()
con.Close()
End Sub

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Hello Harsh Gupta!
your answer works very fine.
thanks for your dedication!