How can I create a table dynamically in SQL using web based interface(gridview)? ASP.NET C#

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C#

ASP.NET

SQL-Server-2012

Hi.
I am working on 'SQL EDITOR' Project and I am stuck at one point,that how user create a table.I solve the database problem,but i don't know how can i resolve he create table problem.Here is my logic:

1: User login
2: Create Database
3: Click create table then select db
4: after selecting db,I've created a textbox(for col name),dropdownlist(for data type), and two checkboxes(one for primary other for allow null)
5: User insert and select values from control and click "insert" button then values shows in gridview,user can also edit and delete column.After inserting values,USER CLICK ON "Create Table" button then values successfully save in database( tbl_field) table but issue with table,Only "First row" of gridview insert in query and table created but only contain one column,because i used for loop and condition gridview.rows.count ,when first time loop start execution then table created just first row inserted inside the query,when second iteration come then table is already created error etc.Can anyone help me about this,how can i do this in better way or how can resolve this issue?Here is my gridview image after user insert values in gridview image

What I have tried:

Here is my create table button code ,I'm receiving values form gridview and i want create table in sql according to gridview column-name,data-type etc.

StringBuilder query = new StringBuilder();
       query.Append("CREATE TABLE ");
       query.Append("ab");
       query.Append(" ( ");

       for (int i = 0; i <GridView2.Rows.Count; i++)
       {
           query.Append(GridView2.Rows[i].Cells[1].Text.ToString());
           query.Append(" ");
           query.Append( GridView2.Rows[i].Cells[2].Text.ToString());
           query.Append(", ");
       }

       if (GridView2.Rows.Count > 1) { query.Length -= 2; }  //Remove trailing ", "
       query.Append(")");
       SqlCommand sqlQuery = new SqlCommand(query.ToString(), cnn);
       SqlDataReader reader = sqlQuery.ExecuteReader();
       cnn.Open();
       sqlQuery.ExecuteNonQuery();
       cnn.Close();