dropdown and textbox in gridview Edit mode

>> and then new value in textbox should be updated when i click on update

Could you please give more detailed information on this?

if you need on client side then In RowDataBound Event add attribute to your Dropdownlist to show selected value in TextBox and on update event find the textbox from the gridview and update back to database.

if you want to do using server side then you need to handle bubbled events for dropdownlists .. that would a big overhead posting page back on every selection.

i have a grid view when user click edit then in edit mode in addition to textbox field i want two dropdownlist
one for hours input other for minutes input. when user enter hour and minutes it should be displayed in textbox as eg 3:23

thanx Mortaza half of the problem solved but how can i update the new txt.Text to my database.

You can write a an sql query to do that, assume that your table's name is Table1 and the field which is needed to be updated is: Time_vc and the primary key which the update should be based on that is ID.

        Dim SQL As String = "UPDATE Table1 SET Time_vc=@Time_vc WHERE ID=@ID"
 
        Dim cnn As New Data.SqlClient.SqlConnection
        Dim cmd As New Data.SqlClient.SqlCommand
 
        cnn.ConnectionString = "<Your Connection String>"
        cmd.Connection = cnn
 
        cmd.CommandType = Data.CommandType.Text
        cmd.CommandText = SQL
 
        Dim P1 As New Data.SqlClient.SqlParameter("@Time_vc", Data.SqlDbType.VarChar, 10)
        P1.Value = txt.Text
 
        Dim P2 As New Data.SqlClient.SqlParameter("@Time_vc", Data.SqlDbType.VarChar, 10)
        P2.Value = GridView1.SelectedDataKey
 
        cmd.Parameters.Add(P1)
        cmd.Parameters.Add(P2)
 
        Try
            cnn.Open()
            cmd.ExecuteNonQuery()
        Finally
            cnn.Close()
            cmd.Dispose()
            cnn.Dispose()
        End Try

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Sorry, line 15 should change to:

        Dim P2 As New Data.SqlClient.SqlParameter("@ID", Data.SqlDbType.Int)

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Or alternatively if you used DataSource controls such as SQLDataSource, you can specify the update command and it does the updating automatically for you.

Thanks murtaza but i am using gridview. and
<EditItemTemplate>
                        <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("StartTime") %>'></asp:TextBox><br />

...
</EditItemTemplate>

NP, '<%# Bind("StartTime") %>' is a two way binding, means that you can update the text box value and see it reflected in your database.