How to query the data in the dataset in C#, take each column of a row of data and put it in the textbox

//Multiple tables, multiple rows and multiple columns 
foreach (DataTable dt in YourDataset.Tables) //traverse all datatable 
  {   
      foreach (DataRow dr in dt.Rows) ///traverse all rows 
          foreach (DataColumn dc in dt.Columns ) //Loop through all columns 
                Console.WriteLine("{0}, {1}, {2}", dt.TableName,   
dc.ColumnName, dr[dc]); //Table name, column name, cell data 
  } 

2. 
// Traverse a table with multiple rows and columns 
  foreach(DataRow mDr in dataSet.Tables[0].Rows )   
  {   
       foreach(DataColumn mDc in dataSet.Tables[0].Columns)   
      {   
                Console.WriteLine(mDr[mDc] .ToString());     
       }   
  } 

3. 
//Traverse a table with multiple rows and one column
foreach(DataRow row in DataSet1.Tables[0].Rows)   
  {   
            Console.WriteLine(row[0].ToString());   
  } 

4. 
//One row and one column 
ds.Tables[0].Rows[0]["field "]