Few days back i came across a question in the forum, the question was to set the visibility of the Button based on the column value. If the value of all the cells in a column is false, button should be visible otherwise it should be hidden.

Let's see how we can achieve this.

Step 1: Add a GridView and a Button in the page.


<asp:GridView ID="GridView1" OnRowDataBound="GridView1_DataBound" runat="server" AutoGenerateColumns="False">
            <Columns>
               <asp:BoundField DataField="ID" HeaderText="ID" />
               <asp:BoundField DataField="Status" HeaderText="Status" />
            </Columns>
</asp:GridView>
<asp:Button ID="btnDisplay" runat="server" Text="Success" Visible="false" />

Step 2: Declare a class level boolean variable


Boolean flag = false;

Step 3: Bind the GridView with data on Page_Load using GetData() method.

protected void Page_Load(object sender, EventArgs e)
{
            GridView1.DataSource = GetData();
            GridView1.DataBind();
}

private DataTable GetData()
{
            DataTable dt = new DataTable("Data");
            dt.Columns.Add(new DataColumn("ID"));
            dt.Columns.Add(new DataColumn("Status"));
            dt.Rows.Add(1, "false");
            dt.Rows.Add(2, "false");
            dt.Rows.Add(3, "false");
            return dt;
}

Step 4: In GridView1_DataBound, check the value of each cell of Status column, set the value of class level flag variable

protected void GridView1_DataBound(object sender, GridViewRowEventArgs e)
{
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                     if (e.Row.Cells[1].Text.Equals("true"))
                     {
                              flag = true;
                     }
            }
}


Step 5: On Page_PreRender set the visibility of the button based on the class level flag variable.

protected void Page_PreRender(object sender, EventArgs e)
{
            if (!flag)
            {
                     btnDisplay.Visible = true;
            }
}

This ends the article.