Passing selecteditem value of a gridview to another page as a string

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My gridviews's OnrowDataBounding, OnselectedIndexchanged events working ok. after selecting control is passing to another page as intended, but selectedindex datakey value is null even in calling page and in details.aspx page. I like to pass this selectedindex value to a string and thereby use in querystring in details page. please help me out with correct coding.

I have also tried as suggested at http://www.codeproject.com/Questions/103062/How-to-get-the-value-of-a-selected-row-in-gridview

My code is as follows

ASP.NET

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns = "False" AllowPaging="true"
    OnPageIndexChanging="gdv1_OnPaging" PageSize="5" DataKeyNames = "Material"
     OnRowDataBound = "gv1_OnRowDataBound" OnSelectedIndexChanged = "gv1_SelectedIndexChanged"
                    CSSClass= "~/Styles" EnableViewState="False" PagerSettings-Mode="Numeric" AutoGenerateSelectButton="true">

C#

 protected void gv1_OnRowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            e.Row.Attributes["onclick"] =     Page.ClientScript.GetPostBackClientHyperlink(GridView1, "Select$" + e.Row.RowIndex);
            e.Row.ToolTip = "Click to select this row.";
        }
    }
protected void gv1_SelectedIndexChanged(object sender, EventArgs e)
    {
        int selectedIndex = GridView1.SelectedIndex;
        string selectedMaterial = (GridView1.DataKeys[selectedIndex]).Value.ToString();
        Server.Transfer("Details.aspx");
    }
//code in details.aspx
 protected void Page_Load(object sender, EventArgs e)
    {
        if (this.Page.PreviousPage != null)
        {
           GridView GridView1 =  GridView)this.Page.PreviousPage.FindControl("GridView1");
            int selectedIndex = GridView1.SelectedIndex;

            string selectedMaterial = (GridView1.DataKeys[selectedIndex]).ToString();
}

What I have tried:

C#

//int selectedIndex = Convert.ToInt32(GridView1.SelectedDataKey[1].ToString());
 int selectedIndex = GridView1.SelectedIndex;
 string customID = (GridView1.DataKeys[selectedIndex]["pkCityId"]).ToString();

Posted 25-Aug-16 4:01am

abmkp

Updated 25-Aug-16 16:14pm

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an0ther1 · Answer 1 · 2016-08-25T16:14:00

Solution 1

Hi abmkp,
You need to add the column pkCityId to the DataKeyNames property of the grid as per below;

ASP.NET

<asp:gridview id="GridView1" runat="server" autogeneratecolumns="False" allowpaging="true" OnPageIndexChanging="gdv1_OnPaging" PageSize="5" DataKeyNames = "Material,pkCityId" OnRowDataBound = "gv1_OnRowDataBound" OnSelectedIndexChanged = "gv1_SelectedIndexChanged" CSSClass= "~/Styles" EnableViewState="False" PagerSettings-Mode="Numeric" AutoGenerateSelectButton="true"</asp:gridview>

Kind Regards

Posted 25-Aug-16 16:14pm

an0ther1

Updated 25-Aug-16 16:15pm

v2

Comments

abmkp 28-Aug-16 10:16am

Hi, my actual Detakeynames is "Material" only and i have added that one. "pkcityId" was referred as example only.

an0ther1 28-Aug-16 19:25pm

To get a field value you need to use as below;
string customID = GridView1.DataKeys[selectedIndex]["mycolumnname"].ToString();
But the column name must be included in the DataKeyNames property of the grid definition.
Assume you have the fields MaterialId, Material, pkCityId and CityName as your Grid columns & you want to get the MaterialId & pkCityId values from your code behind you would add these to the DataKeyNames and access them using the code above.
Additionally, check the value of the GridView.SelectedIndex. Personally I use the following;
int intRow = this.GridView1.SelectedRow.RowIndex;

Kind Regards