下拉列表未提供所选值

Question

I had this aspx source code

<tr>
            <td>MatchName</td>
            <td>
                <asp:DropDownList ID="ddlMatchName" runat="server">
                </asp:DropDownList>
            </td>
        </tr>
        <tr>
            <td>Winning Team</td>
            <td>
                <asp:DropDownList ID="ddlWinningTeam" runat="server">
                </asp:DropDownList>
            </td>
        </tr>
        <tr>
            <td>Score</td>
            <td>
                <asp:TextBox ID="txtScore" runat="server"></asp:TextBox>
            </td>
        </tr>
        <tr>
            <td>
                <asp:Button ID="btnSave" runat="server" Text="Save"  OnClick="btnSave_Click" />
            </td>
            <td>
                <asp:Button ID="btnCancel" runat="server" Text="Cancel" OnClick="btnCancel_Click" />
            </td>
        </tr>

C# Code

 protected void Page_Load(object sender, EventArgs e)
    {
        string queryMatchDetail = "select MatchId,MatchName from ADMMasterMatch order by MatchDate";
        ddlMatchName.DataSource = clsNewSqlFunctions.GetSelectedData(queryMatchDetail);
        ddlMatchName.DataTextField = "MatchName";
        ddlMatchName.DataValueField = "MatchId";
        ddlMatchName.DataBind();

        string queryTeamDetail = "SELECT [TeamId],[TeamName] FROM [AdmCurrentEventMasterTeam] order by TeamName";
        ddlWinningTeam.DataSource = clsNewSqlFunctions.GetSelectedData(queryTeamDetail);
        ddlWinningTeam.DataTextField = "TeamName";
        //ddlWinningTeam.DataValueField = "TeamId";
        ddlWinningTeam.DataBind();

    }

    protected void btnSave_Click(object sender, EventArgs e)
    {
        var s = ddlMatchName.SelectedIndex;
        string query = "UPDATE [ADMMasterMatch] SET Winner = '" + ddlWinningTeam.SelectedItem.Text + "' , Score = '" + txtScore.Text + "' Where MatchId ='" + ddlMatchName.SelectedItem.Text +"'";
        clsNewSqlFunctions.ExecuteQuery(query);
    }
    protected void btnCancel_Click(object sender, EventArgs e)
    {
        Response.Redirect("ADMCurrentEventMatchResult.aspx");
    }

Here clsNewSqlFunctions.ExecuteQuery() and clsNewSqlFunctions.GetSelectedData() are method to execute query and select data which return data in form of dataset

on Save_Click event i am updating data on database from selected value of dropdown list but it is not showing me selected value
It always show value at index 0. on SelectedText,SelectedItem
please help me what is wrong with my code

Answer 1

Please bind your dropdown in !ispostback

 protected void Page_Load(object sender, EventArgs e)
    {
      if(!ispostback)
      {
        string queryMatchDetail = "select MatchId,MatchName from ADMMasterMatch order by MatchDate";
        ddlMatchName.DataSource = clsNewSqlFunctions.GetSelectedData(queryMatchDetail);
        ddlMatchName.DataTextField = "MatchName";
        ddlMatchName.DataValueField = "MatchId";
        ddlMatchName.DataBind();

        string queryTeamDetail = "SELECT [TeamId],[TeamName] FROM [AdmCurrentEventMasterTeam] order by TeamName";
        ddlWinningTeam.DataSource = clsNewSqlFunctions.GetSelectedData(queryTeamDetail);
        ddlWinningTeam.DataTextField = "TeamName";
        //ddlWinningTeam.DataValueField = "TeamId";
        ddlWinningTeam.DataBind();
      }

    }

When you click a button page again postbacks and which will result in binding the dropdown again..So you will get the selected value as the first index of the dropdown..