In this example, we are going to show you how to create an HTML table dynamically in ASP.NET using C#.

Create an HTML dynamically in ASP.NET

For many reasons, a developer might need to create a table dynamically. For example, looping through a DataTable in order to print out the rows on the web page requires a table to be created dynamically, as the row number changes based on how many records you have in that DataTable.

The output HTML of the table will be assigned to a literal. So the code of our markup is simply as the following:

 <asp:Literal ID="DynamicTable" runat="server"></asp:Literal>

Now import the following namespace to use the string builder class

using System.Text;

And one more to create the DataTable

using System.Data;

Now move to the code behind and add the following code to the Page_Load event

     protected void Page_Load(object sender, EventArgs e)
            if (!this.IsPostBack)
                DataTable dt = new DataTable();
                dt.Columns.AddRange(new DataColumn[2] { 
                    new DataColumn("Name", typeof(string)),
                    new DataColumn("Department",typeof(string)) });
                dt.Rows.Add("Brian", "IT");
                dt.Rows.Add("Ed", "Help Desk");
                dt.Rows.Add("Peter", "Engineering");
                dt.Rows.Add("Scott", "Engineering");

                StringBuilder sb = new StringBuilder();

                sb.Append("<table cellpadding='3' cellspacing='3' style='border: 1px solid #800000;font-size: 12pt;font-family:Arial'>");

                //Add Table Header
                foreach (DataColumn column in dt.Columns)
                    sb.Append("<th style='background-color: #3366ff;border: 1px solid #000'>" + column.ColumnName + "</th>");

                //Add Table Rows
                foreach (DataRow row in dt.Rows)
                    //Add Table Columns
                    foreach (DataColumn column in dt.Columns)
                        sb.Append("<td style='width:100px;border: 1px solid #ccc'>" + row[column.ColumnName].ToString() + "</td>");

                DynamicTable.Text = sb.ToString();


Code Explanation

The code above is to create a DataTable and data to it. You can, however, get the data from a database, an API, or from an external file, depending on your requirements.

After the datatable is created and populated with a sample data, we are going to use two for each loop to iterate through the datatable columns and rows, then append the content of the datatable into a string builder variable.

The last step is to assign the value of the string builder variable to the literal.

Run the solution; the output should be something similar to the picture below:

Result of Dynamic HTML Table

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Last modified: July 9, 2019


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